Macaroeris nidicolens
- Group
- Spiders
- Peak month
- June
- Records since 2000
- 70
Maccoa Duck
- Group
- Birds
- Peak month
- April
- Records since 2000
- 57
Machaerium maritimae
- Group
- True flies
- Peak month
- June
- Records since 2000
- 143
Machimus rusticus
- Group
- True flies
- Peak month
- July
- Records since 2000
- 225
Mackay's Pouncewort
- Group
- Liverworts
- Peak month
- March
- Records since 2000
- 721
Mackerel Scad
- Group
- Fish
- Peak month
- October
- Records since 2000
- 2,296
Macquartia dispar
- Group
- True flies
- Peak month
- May
- Records since 2000
- 111
Macquartia grisea
- Group
- True flies
- Peak month
- August
- Records since 2000
- 117
Macquartia praefica
- Group
- True flies
- Peak month
- June
- Records since 2000
- 126
Macquartia tenebricosa
- Group
- True flies
- Peak month
- August
- Records since 2000
- 154
Macrargus rufus
- Group
- Spiders
- Peak month
- February
- Records since 2000
- 51
Macrocera stigmoides
- Group
- True flies
- Peak month
- June
- Records since 2000
- 57
Macrocera vittata
- Group
- True flies
- Peak month
- June
- Records since 2000
- 101
Macrochaeta clavicornis
- Group
- Worms (annelids)
- Peak month
- July
- Records since 2000
- 902
Macrochaeta helgolandica
- Group
- Worms (annelids)
- Peak month
- July
- Records since 2000
- 248
Macrocystidia cucumis
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 340
Macrodema microptera
- Group
- True bugs
- Peak month
- August
- Records since 2000
- 174
Macrodiplosis pustularis
- Group
- True flies
- Peak month
- June
- Records since 2000
- 143
Macrodiplosis volvens
- Group
- True flies
- Peak month
- September
- Records since 2000
- 82
Macrogastra rolphii
- Group
- Molluscs
- Peak month
- October
- Records since 2000
- 128
Macrolepiota excoriata
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 56
Macrolepiota mastoidea
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 422
Macrolophus costalis
- Group
- True bugs
- Peak month
- August
- Records since 2000
- 74
Macronychia dolini
- Group
- True flies
- Peak month
- July
- Records since 2000
- 51
Macropelopia nebulosa
- Group
- True flies
- Peak month
- April
- Records since 2000
- 172
Macropelopia notata
- Group
- True flies
- Peak month
- July
- Records since 2000
- 381
Macrophya albicincta
- Group
- Bees, wasps and ants
- Peak month
- May
- Records since 2000
- 124
Macrophya alboannulata
- Group
- Bees, wasps and ants
- Peak month
- May
- Records since 2000
- 106
Macrophya duodecimpunctata
- Group
- Bees, wasps and ants
- Peak month
- June
- Records since 2000
- 117
Macrophya montana
- Group
- Bees, wasps and ants
- Peak month
- June
- Records since 2000
- 394
Macrophya ribis
- Group
- Bees, wasps and ants
- Peak month
- May
- Records since 2000
- 90
Macrophya rufipes
- Group
- Bees, wasps and ants
- Peak month
- May
- Records since 2000
- 100
Macropipus tuberculatus
- Group
- Crustaceans
- Peak month
- March
- Records since 2000
- 176
Macropis europaea
- Group
- Bees, wasps and ants
- Peak month
- July
- Records since 2000
- 295
Macropodia deflexa
- Group
- Crustaceans
- Peak month
- August
- Records since 2000
- 53
Macropodia linaresi
- Group
- Crustaceans
- Peak month
- March
- Records since 2000
- 374
Macropsis cerea
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 63
Macropsis prasina
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 83
Macropsis scotti
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 121
Macropsis scutellata
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 88
Macrosaldula scotica
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 119
Macrosiphoniella artemisiae
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 72
Macrosiphoniella millefolii
- Group
- True bugs
- Peak month
- August
- Records since 2000
- 146
Macrosiphum albifrons
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 79
Macrosiphum gei
- Group
- True bugs
- Peak month
- May
- Records since 2000
- 69
Macrosteles horvathi
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 51
Macrosteles laevis
- Group
- True bugs
- Peak month
- August
- Records since 2000
- 136
Macrosteles lividus
- Group
- True bugs
- Peak month
- June
- Records since 2000
- 81
Macrosteles sexnotatus
- Group
- True bugs
- Peak month
- August
- Records since 2000
- 213
Macrosteles variatus
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 50
Macrosteles viridigriseus
- Group
- True bugs
- Peak month
- August
- Records since 2000
- 222
Macrotylus paykullii
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 206
Macrotylus solitarius
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 105
Macrotyphula phacorrhiza
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 70
Maculinea arion
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 388
Macustus grisescens
- Group
- True bugs
- Peak month
- June
- Records since 2000
- 308
Madiera cranesbill
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 175
Maera grossimana
- Group
- Crustaceans
- Peak month
- May
- Records since 2000
- 241
Maera loveni
- Group
- Crustaceans
- Peak month
- January
- Records since 2000
- 171
Maerella tenuimana
- Group
- Crustaceans
- Peak month
- August
- Records since 2000
- 1,056
Maerl spec.
- Group
- Other plants
- Peak month
- September
- Records since 2000
- 3,180
Magdalis armigera
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 163
Magdalis cerasi
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 144
Magdalis memnonia
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 86
Magdalis ruficornis
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 89
Magellanic Bog-moss
- Group
- Mosses
- Peak month
- August
- Records since 2000
- 1,583
Magellanic Diving-petrel
- Group
- Birds
- Peak month
- October
- Records since 2000
- 74
Magellanic Penguin
- Group
- Birds
- Peak month
- October
- Records since 2000
- 74
Magelona alleni
- Group
- Worms (annelids)
- Peak month
- June
- Records since 2000
- 5,676
Magelona filiformis
- Group
- Worms (annelids)
- Peak month
- June
- Records since 2000
- 4,738
Magelona johnstoni
- Group
- Worms (annelids)
- Peak month
- June
- Records since 2000
- 4,540
Magelona minuta
- Group
- Worms (annelids)
- Peak month
- July
- Records since 2000
- 2,080
Magnificent Frigatebird
- Group
- Birds
- Peak month
- October
- Records since 2000
- 79
Magnolia Warbler
- Group
- Birds
- Peak month
- September
- Records since 2000
- 166
Magpie [moth]
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 3,398
Magpie Inkcap
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 607
Maiden Pink
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 241
Maiden's Blush
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 2,078
Maidenhair Fern
- Group
- Ferns and horsetails
- Peak month
- September
- Records since 2000
- 156
Maidenhair Pocket-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 4,452
Maidenhair Spleenwort
- Group
- Ferns and horsetails
- Peak month
- April
- Records since 2000
- 6,221
Maidenhair vine
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 243
Malachite Beetle
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 5,702
Malacoceros fuliginosus
- Group
- Worms (annelids)
- Peak month
- June
- Records since 2000
- 3,920
Malacoceros tetracerus
- Group
- Worms (annelids)
- Peak month
- June
- Records since 2000
- 240
Malacoceros vulgaris
- Group
- Worms (annelids)
- Peak month
- May
- Records since 2000
- 55
Malacolimax tenellus
- Group
- Molluscs
- Peak month
- November
- Records since 2000
- 446
Malacomyia sciomyzina
- Group
- True flies
- Peak month
- September
- Records since 2000
- 53
Malbranchea flocciformis
- Group
- Fungi
- Peak month
- January
- Records since 2000
- 62
Maldane sarsi
- Group
- Worms (annelids)
- Peak month
- August
- Records since 2000
- 55
Male-fern
- Group
- Ferns and horsetails
- Peak month
- May
- Records since 2000
- 11,400
Mallard
- Group
- Birds
- Peak month
- April
- Records since 2000
- 1,074,515
Mallota cimbiciformis
- Group
- True flies
- Peak month
- June
- Records since 2000
- 54
Mallow
- Group
- Butterflies and moths
- Peak month
- October
- Records since 2000
- 203
Malmgrenia andreapolis
- Group
- Worms (annelids)
- Peak month
- June
- Records since 2000
- 1,016
Malmgrenia arenicolae
- Group
- Worms (annelids)
- Peak month
- July
- Records since 2000
- 2,111
Malmgrenia castanea
- Group
- Worms (annelids)
- Peak month
- March
- Records since 2000
- 278
Malmgrenia darbouxi
- Group
- Worms (annelids)
- Peak month
- August
- Records since 2000
- 626
Malmgrenia ljungmani
- Group
- Worms (annelids)
- Peak month
- August
- Records since 2000
- 1,660
Malmgrenia lunulata
- Group
- Worms (annelids)
- Peak month
- September
- Records since 2000
- 76
Malmgrenia marphysae
- Group
- Worms (annelids)
- Peak month
- August
- Records since 2000
- 1,153
Malmgrenia mcintoshi
- Group
- Worms (annelids)
- Peak month
- August
- Records since 2000
- 605
Malthinus balteatus
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 117
Malthinus flaveolus
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 730
Malthinus seriepunctatus
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 586
Malthodes dispar
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 53
Malthodes flavoguttatus
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 64
Malthodes fuscus
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 234
Malthodes guttifer
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 66
Malthodes marginatus
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 660
Malthodes minimus
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 463
Malthodes mysticus
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 107
Malthodes pumilus
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 135
Malva clementii
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 50
Mamillate Plait-moss
- Group
- Mosses
- Peak month
- April
- Records since 2000
- 10,616
Man Orchid
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 266
Man-of-War Bird
- Group
- Birds
- Peak month
- October
- Records since 2000
- 75
Manayunkia aestuarina
- Group
- Worms (annelids)
- Peak month
- March
- Records since 2000
- 674
Mandarin Duck
- Group
- Birds
- Peak month
- April
- Records since 2000
- 50,596
Maned sea anemone
- Group
- Jellyfish, corals and anemones
- Peak month
- September
- Records since 2000
- 474
Mangelia attenuata
- Group
- Molluscs
- Peak month
- July
- Records since 2000
- 107
Mangelia coarctata
- Group
- Molluscs
- Peak month
- March
- Records since 2000
- 127
Mangelia costata
- Group
- Molluscs
- Peak month
- September
- Records since 2000
- 191
Manna Ash
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 105
Mantis shrimp
- Group
- Crustaceans
- Peak month
- August
- Records since 2000
- 142
Manx Shearwater
- Group
- Birds
- Peak month
- August
- Records since 2000
- 30,622
Many-forked Cladonia
- Group
- Lichens
- Peak month
- September
- Records since 2000
- 2,510
Many-fruited Leskea
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 2,223
Many-fruited Thyme-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 2,624
Many-leaved Pocket-moss
- Group
- Mosses
- Peak month
- January
- Records since 2000
- 135
Many-pored Punch Lichen
- Group
- Fungi
- Peak month
- March
- Records since 2000
- 1,242
Many-seeded Goosefoot
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 672
Many-stalked Spike-rush
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 291
Many-tufted Sedgesitter
- Group
- True flies
- Peak month
- August
- Records since 2000
- 1,409
Map lichen
- Group
- Lichens
- Peak month
- June
- Records since 2000
- 450
Map lichen
- Group
- Lichens
- Peak month
- August
- Records since 2000
- 94
Map-Winged Swift
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 1,274
Maple Mildew
- Group
- Fungi
- Peak month
- September
- Records since 2000
- 1,246
Marasmarcha lunaedactyla
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 135
Marasmiellus candidus
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 50
Marasmius bulliardii
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 69
Marasmius cohaerens
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 161
Marasmius curreyi
- Group
- Fungi
- Peak month
- July
- Records since 2000
- 66
Marasmius epiphylloides
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 98
Marasmius epiphyllus
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 292
Marasmius limosus
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 51
Marasmius torquescens
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 83
Marasmius wynneae
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 283
Marble Gall
- Group
- Bees, wasps and ants
- Peak month
- September
- Records since 2000
- 2,642
Marble Screw-moss
- Group
- Mosses
- Peak month
- January
- Records since 2000
- 2,509
Marbled Beauty
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 3,570
Marbled Bell
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 781
Marbled Brown
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 877
Marbled coronet
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 212
Marbled Crenella
- Group
- Molluscs
- Peak month
- May
- Records since 2000
- 1,808
Marbled Duck
- Group
- Birds
- Peak month
- April
- Records since 2000
- 109
Marbled Minor
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 962
Marbled Orchard Tortrix
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 1,948
Marbled Piercer
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 2,159
Marbled Sedge
- Group
- Caddisflies
- Peak month
- July
- Records since 2000
- 1,687
Marbled Swimming Crab
- Group
- Crustaceans
- Peak month
- August
- Records since 2000
- 581
Marbled White
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 221,435
Marbled White Spot
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 1,180
March Moth
- Group
- Butterflies and moths
- Peak month
- March
- Records since 2000
- 1,753
Marchandiomyces corallinus
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 272
Marchantiana asserigena
- Group
- Lichens
- Peak month
- March
- Records since 2000
- 91
Mare's-tail
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 766
Marenzelleria viridis
- Group
- Worms (annelids)
- Peak month
- March
- Records since 2000
- 120
Margarites helicinus
- Group
- Molluscs
- Peak month
- August
- Records since 2000
- 153
Margined click beetle
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 1,577
Margined Colletes
- Group
- Bees, wasps and ants
- Peak month
- July
- Records since 2000
- 71
Margined Ramshorn
- Group
- Molluscs
- Peak month
- May
- Records since 2000
- 2,217
Marine worm
- Group
- Worms (annelids)
- Peak month
- May
- Records since 2000
- 3,912
Marinogammarus marinus
- Group
- Crustaceans
- Peak month
- August
- Records since 2000
- 63
Maritime gardensnail
- Group
- Molluscs
- Peak month
- September
- Records since 2000
- 1,820
Maritime pine
- Group
- Conifers
- Peak month
- March
- Records since 2000
- 64
Marmalade hoverfly
- Group
- True flies
- Peak month
- July
- Records since 2000
- 46,804
Marmora's Warbler
- Group
- Birds
- Peak month
- June
- Records since 2000
- 103
Marpissa muscosa
- Group
- Spiders
- Peak month
- May
- Records since 2000
- 194
Marpissa nivoyi
- Group
- Spiders
- Peak month
- August
- Records since 2000
- 115
Marpissa radiata
- Group
- Spiders
- Peak month
- June
- Records since 2000
- 131
Marquandomyces marquandii
- Group
- Fungi
- Peak month
- January
- Records since 2000
- 179
Marram Weevil
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 1,174
Marsenia perspicua
- Group
- Molluscs
- Peak month
- August
- Records since 2000
- 88
Marsh Arrowgrass
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 936
Marsh Bryum
- Group
- Mosses
- Peak month
- July
- Records since 2000
- 8,764
Marsh Cinquefoil
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 2,914
Marsh Clubmoss
- Group
- Clubmosses
- Peak month
- September
- Records since 2000
- 494
Marsh Cudweed
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 2,822
Marsh Damselbug
- Group
- True bugs
- Peak month
- August
- Records since 2000
- 1,537
Marsh Dock
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 143
Marsh earwort
- Group
- Liverworts
- Peak month
- August
- Records since 2000
- 108
Marsh Fern
- Group
- Ferns and horsetails
- Peak month
- August
- Records since 2000
- 956
Marsh fly
- Group
- True flies
- Peak month
- June
- Records since 2000
- 1,239
Marsh Forklet-moss
- Group
- Mosses
- Peak month
- July
- Records since 2000
- 3,405
Marsh Foxtail
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 2,883
Marsh Fragrant-orchid
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 148
Marsh Fritillary
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 14,938
Marsh Frog
- Group
- Amphibians
- Peak month
- May
- Records since 2000
- 1,516
Marsh Gentian
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 249
Marsh Hawk's-beard
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 877
Marsh Helleborine
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 925
Marsh Horsetail
- Group
- Ferns and horsetails
- Peak month
- June
- Records since 2000
- 2,785
Marsh Lousewort
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 1,298
Marsh Marigold Moth
- Group
- Butterflies and moths
- Peak month
- May
- Records since 2000
- 959
Marsh oblique-barred
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 163
Marsh Pea
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 159
Marsh Pennywort
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 4,010
Marsh Ragwort
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 1,781
Marsh Sandpiper
- Group
- Birds
- Peak month
- September
- Records since 2000
- 620
Marsh Slug
- Group
- Molluscs
- Peak month
- May
- Records since 2000
- 1,169
Marsh Sow-thistle
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 215
Marsh Speedwell
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 759
Marsh St John's-wort
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 783
Marsh Thistle
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 16,059
Marsh Thyme-moss
- Group
- Mosses
- Peak month
- July
- Records since 2000
- 727
Marsh Tit
- Group
- Birds
- Peak month
- January
- Records since 2000
- 47,776
Marsh Valerian
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 1,195
Marsh Violet
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 3,858
Marsh Warbler/Eurasian Reed Warbler
- Group
- Birds
- Peak month
- June
- Records since 2000
- 524
Marsh Whorl Snail
- Group
- Molluscs
- Peak month
- October
- Records since 2000
- 463
Marsh Willowherb
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 3,567
Marsh Woundwort
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 7,315
Marsh Yellow-cress
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 716
Marsh-mallow
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 831
Marsh-marigold
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 9,736
Marsham's Nomad Bee
- Group
- Bees, wasps and ants
- Peak month
- May
- Records since 2000
- 1,931
Marshpepper Knotweed
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 2,959
Marssonina betulae
- Group
- Fungi
- Peak month
- September
- Records since 2000
- 56
Marsupella aquatica
- Group
- Liverworts
- Peak month
- June
- Records since 2000
- 607
Marsupella sphacelata
- Group
- Liverworts
- Peak month
- July
- Records since 2000
- 122
Martagon Lily
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 522
Marvania geminata
- Group
- Seaweeds and algae
- Peak month
- January
- Records since 2000
- 93
Masked Crab
- Group
- Crustaceans
- Peak month
- July
- Records since 2000
- 3,495
Masked Hunter
- Group
- True bugs
- Peak month
- June
- Records since 2000
- 170
Masked Shrike
- Group
- Birds
- Peak month
- October
- Records since 2000
- 195
Maso gallicus
- Group
- Spiders
- Peak month
- August
- Records since 2000
- 131
Maso sundevalli
- Group
- Spiders
- Peak month
- June
- Records since 2000
- 277
Mason Bee
- Group
- Bees, wasps and ants
- Peak month
- May
- Records since 2000
- 1,412
Mason bee
- Group
- Bees, wasps and ants
- Peak month
- May
- Records since 2000
- 110
Mason bee
- Group
- Bees, wasps and ants
- Peak month
- June
- Records since 2000
- 83
Masoreus wetterhallii
- Group
- Beetles
- Peak month
- August
- Records since 2000
- 54
Massalongia carnosa
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 148
Massive horny sponge
- Group
- Sponges
- Peak month
- May
- Records since 2000
- 2,650
Mastigophora woodsii
- Group
- Liverworts
- Peak month
- June
- Records since 2000
- 240
Mat-grass
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 6,125
Matchstick Flapwort
- Group
- Liverworts
- Peak month
- March
- Records since 2000
- 650
Matt Fanvault
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 80
Matt felt lichen
- Group
- Lichens
- Peak month
- January
- Records since 2000
- 196
Matte bolete
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 546
Matted Feather-moss
- Group
- Mosses
- Peak month
- March
- Records since 2000
- 2,494
Matthiola incana
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 134
Mauve stinger
- Group
- Jellyfish, corals and anemones
- Peak month
- November
- Records since 2000
- 169
Maxmuelleria lankesteri
- Group
- Worms (annelids)
- Peak month
- March
- Records since 2000
- 329
May Highflyer
- Group
- Butterflies and moths
- Peak month
- May
- Records since 2000
- 850
Meadow Barley
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 1,118
Meadow brome
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 1,558
Meadow Brown
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 1,291,987
Meadow Buttercup
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 20,980
Meadow Campion
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 6,145
Meadow clary
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 331
Meadow Coral
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 2,112
Meadow Crane's-bill
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 9,089
Meadow Foxtail
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 8,431
Meadow Grasshopper
- Group
- Grasshoppers and crickets
- Peak month
- July
- Records since 2000
- 16,828
Meadow Grey
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 920
Meadow oat grass
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 735
Meadow Oat-grass
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 756
Meadow Pipit
- Group
- Birds
- Peak month
- October
- Records since 2000
- 406,836
Meadow Plant Bug
- Group
- True bugs
- Peak month
- June
- Records since 2000
- 4,871
Meadow Puffball
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 782
Meadow Saffron
- Group
- Flowering plants
- Peak month
- September
- Records since 2000
- 306
Meadow Saxifrage
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 1,545
Meadow Thistle
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 545
Meadow Vetchling
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 16,208
Meadow Waxcap
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 5,675
Meadow-foam
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 636
Meadowsweet
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 27,430
Meadowsweet Rust
- Group
- Fungi
- Peak month
- June
- Records since 2000
- 708
Mealworm
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 270
Mealy Firedot Lichen
- Group
- Lichens
- Peak month
- September
- Records since 2000
- 1,068
Mealy lichen
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 149
Mealy Pixie-cup
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 3,399
Mealy Shadow Lichen
- Group
- Lichens
- Peak month
- June
- Records since 2000
- 4,650
Mealy-rimmed Shingle Lichen
- Group
- Lichens
- Peak month
- November
- Records since 2000
- 1,251
Mecinus circulatus
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 95
Mecinus collaris
- Group
- Beetles
- Peak month
- August
- Records since 2000
- 84
Mecinus labilis
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 160
Mecomma ambulans
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 317
Mecyna asinalis
- Group
- Butterflies and moths
- Peak month
- August
- Records since 2000
- 52
Medetera abstrusa
- Group
- True flies
- Peak month
- May
- Records since 2000
- 62
Medetera jacula
- Group
- True flies
- Peak month
- June
- Records since 2000
- 70
Medetera muralis
- Group
- True flies
- Peak month
- June
- Records since 2000
- 120
Medetera pallipes
- Group
- True flies
- Peak month
- June
- Records since 2000
- 76
Medetera petrophila
- Group
- True flies
- Peak month
- June
- Records since 2000
- 194
Medetera saxatilis
- Group
- True flies
- Peak month
- July
- Records since 2000
- 125
Medetera truncorum
- Group
- True flies
- Peak month
- July
- Records since 2000
- 242
Median wasp
- Group
- Bees, wasps and ants
- Peak month
- July
- Records since 2000
- 1,106
Medicago varia
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 67
Medicinal leech
- Group
- Worms (annelids)
- Peak month
- August
- Records since 2000
- 54
Medicorophium affine
- Group
- Crustaceans
- Peak month
- June
- Records since 2000
- 167
Medina collaris
- Group
- True flies
- Peak month
- June
- Records since 2000
- 187
Medina luctuosa
- Group
- True flies
- Peak month
- May
- Records since 2000
- 71
Mediterranean Codling
- Group
- Fish
- Peak month
- April
- Records since 2000
- 395
Mediterranean Grenadier
- Group
- Fish
- Peak month
- September
- Records since 2000
- 125
Mediterranean Gull
- Group
- Birds
- Peak month
- August
- Records since 2000
- 120,966
Mediterranean Shearwater
- Group
- Birds
- Peak month
- July
- Records since 2000
- 96
Medium flowered winter-cress
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 204
Medium Sedge
- Group
- Caddisflies
- Peak month
- May
- Records since 2000
- 5,472
Medium-sized bark louse
- Group
- Other insects
- Peak month
- December
- Records since 2000
- 854
Medlar
- Group
- Flowering plants
- Peak month
- September
- Records since 2000
- 302
Megabunus diadema
- Group
- Mites, harvestmen and other arachnids
- Peak month
- June
- Records since 2000
- 246
Megachile burdigalensis
- Group
- Bees, wasps and ants
- Peak month
- July
- Records since 2000
- 73
Megachile circumcincta
- Group
- Bees, wasps and ants
- Peak month
- June
- Records since 2000
- 102
Megachile maritima
- Group
- Bees, wasps and ants
- Peak month
- July
- Records since 2000
- 349
Megachile versicolor
- Group
- Bees, wasps and ants
- Peak month
- July
- Records since 2000
- 422
Megacoelum infusum
- Group
- True bugs
- Peak month
- August
- Records since 2000
- 211
Megalaria lichen
- Group
- Lichens
- Peak month
- July
- Records since 2000
- 358
Megalaria pulverea
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 1,294
Megalinus glabratus
- Group
- Beetles
- Peak month
- August
- Records since 2000
- 109
Megalocoleus molliculus
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 121
Megalocoleus tanaceti
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 78
Megalonotus chiragra
- Group
- True bugs
- Peak month
- June
- Records since 2000
- 153
Megalonotus emarginatus
- Group
- True bugs
- Peak month
- May
- Records since 2000
- 58
Megalonotus praetextatus
- Group
- True bugs
- Peak month
- May
- Records since 2000
- 109
Megaluropus agilis
- Group
- Crustaceans
- Peak month
- July
- Records since 2000
- 1,556
Megamelodes lequesnei
- Group
- True bugs
- Peak month
- June
- Records since 2000
- 77
Megamelodes quadrimaculatus
- Group
- True bugs
- Peak month
- October
- Records since 2000
- 129
Megamelus notulus
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 74
Megamphopus cornutus
- Group
- Crustaceans
- Peak month
- August
- Records since 2000
- 2,806
Meganola albula
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 288
Meganola strigula
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 57
Megapolitan Feather-moss
- Group
- Mosses
- Peak month
- January
- Records since 2000
- 534
Megarthrus denticollis
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 57
Megarthrus depressus
- Group
- Beetles
- Peak month
- August
- Records since 2000
- 61
Megaselia abditus
- Group
- True flies
- Peak month
- July
- Records since 2000
- 55
Megaselia altifrons
- Group
- True flies
- Peak month
- April
- Records since 2000
- 207
Megaselia basispinata
- Group
- True flies
- Peak month
- June
- Records since 2000
- 124
Megaselia berndseni
- Group
- True flies
- Peak month
- August
- Records since 2000
- 77
Megaselia brevicostalis
- Group
- True flies
- Peak month
- August
- Records since 2000
- 761
Megaselia ciliata
- Group
- True flies
- Peak month
- October
- Records since 2000
- 955
Megaselia cinerea
- Group
- True flies
- Peak month
- June
- Records since 2000
- 186
Megaselia clemonsi
- Group
- True flies
- Peak month
- July
- Records since 2000
- 89
Megaselia emarginata
- Group
- True flies
- Peak month
- July
- Records since 2000
- 268
Megaselia errata
- Group
- True flies
- Peak month
- August
- Records since 2000
- 168
Megaselia flava
- Group
- True flies
- Peak month
- July
- Records since 2000
- 155
Megaselia fungivora
- Group
- True flies
- Peak month
- May
- Records since 2000
- 57
Megaselia fuscovariana
- Group
- True flies
- Peak month
- July
- Records since 2000
- 82
Megaselia giraudii
- Group
- True flies
- Peak month
- June
- Records since 2000
- 109
Megaselia gregaria
- Group
- True flies
- Peak month
- June
- Records since 2000
- 147
Megaselia hibernans
- Group
- True flies
- Peak month
- October
- Records since 2000
- 85
Megaselia hilaris
- Group
- True flies
- Peak month
- May
- Records since 2000
- 101
Megaselia hirticrus
- Group
- True flies
- Peak month
- July
- Records since 2000
- 399
Megaselia ignobilis
- Group
- True flies
- Peak month
- July
- Records since 2000
- 58
Megaselia involuta
- Group
- True flies
- Peak month
- October
- Records since 2000
- 713
Megaselia joanneae
- Group
- True flies
- Peak month
- August
- Records since 2000
- 69
Megaselia lata
- Group
- True flies
- Peak month
- August
- Records since 2000
- 111
Megaselia latifemorata
- Group
- True flies
- Peak month
- April
- Records since 2000
- 51
Megaselia longicostalis
- Group
- True flies
- Peak month
- August
- Records since 2000
- 399
Megaselia lucifrons
- Group
- True flies
- Peak month
- June
- Records since 2000
- 296
Megaselia lutea
- Group
- True flies
- Peak month
- July
- Records since 2000
- 108
Megaselia meconicera
- Group
- True flies
- Peak month
- June
- Records since 2000
- 102
Megaselia nigriceps
- Group
- True flies
- Peak month
- June
- Records since 2000
- 1,095
Megaselia paludosa
- Group
- True flies
- Peak month
- July
- Records since 2000
- 61
Megaselia pectoralis
- Group
- True flies
- Peak month
- October
- Records since 2000
- 57
Megaselia pleuralis
- Group
- True flies
- Peak month
- August
- Records since 2000
- 1,064
Megaselia pulicaria
- Group
- True flies
- Peak month
- April
- Records since 2000
- 171
Megaselia pumila
- Group
- True flies
- Peak month
- June
- Records since 2000
- 752
Megaselia rufa
- Group
- True flies
- Peak month
- June
- Records since 2000
- 99
Megaselia ruficornis
- Group
- True flies
- Peak month
- June
- Records since 2000
- 144
Megaselia sepulchralis
- Group
- True flies
- Peak month
- June
- Records since 2000
- 678
Megaselia sp. BOLD:ACX6055
- Group
- True flies
- Peak month
- August
- Records since 2000
- 808
Megaselia spinicincta
- Group
- True flies
- Peak month
- July
- Records since 2000
- 153
Megaselia subpleuralis
- Group
- True flies
- Peak month
- November
- Records since 2000
- 104
Megaselia subtumida
- Group
- True flies
- Peak month
- April
- Records since 2000
- 283
Megaselia tarsalis
- Group
- True flies
- Peak month
- August
- Records since 2000
- 360
Megaselia tenebricola
- Group
- True flies
- Peak month
- October
- Records since 2000
- 81
Megaselia verna
- Group
- True flies
- Peak month
- July
- Records since 2000
- 70
Megaselia vestita
- Group
- True flies
- Peak month
- June
- Records since 2000
- 89
Megaselia woodi
- Group
- True flies
- Peak month
- October
- Records since 2000
- 147
Megasternum concinnum
- Group
- Beetles
- Peak month
- August
- Records since 2000
- 907
Megastylus orbitator
- Group
- Bees, wasps and ants
- Peak month
- June
- Records since 2000
- 66
Megasyrphus erratica
- Group
- True flies
- Peak month
- August
- Records since 2000
- 61
Megatoma undata
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 236
Megophthalmus scabripennis
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 116
Megophthalmus scanicus
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 217
Megoura viciae
- Group
- True bugs
- Peak month
- May
- Records since 2000
- 73
Megrim
- Group
- Fish
- Peak month
- November
- Records since 2000
- 40,342
Meigenia mutabilis
- Group
- True flies
- Peak month
- July
- Records since 2000
- 364
Meiosimyza affinis
- Group
- True flies
- Peak month
- June
- Records since 2000
- 56
Meiosimyza decempunctata
- Group
- True flies
- Peak month
- July
- Records since 2000
- 244
Meiosimyza decipiens
- Group
- True flies
- Peak month
- June
- Records since 2000
- 330
Meiosimyza illota
- Group
- True flies
- Peak month
- July
- Records since 2000
- 133
Meiosimyza pallidiventris
- Group
- True flies
- Peak month
- June
- Records since 2000
- 89
Meiosimyza platycephala
- Group
- True flies
- Peak month
- June
- Records since 2000
- 162
Meiosimyza stylata
- Group
- True flies
- Peak month
- July
- Records since 2000
- 118
Meiosimyza subfasciata
- Group
- True flies
- Peak month
- July
- Records since 2000
- 126
Meiosimyza vittata
- Group
- True flies
- Peak month
- May
- Records since 2000
- 53
Melampophylax mucoreus
- Group
- Caddisflies
- Peak month
- May
- Records since 2000
- 742
Melampsora allii-fragilis
- Group
- Fungi
- Peak month
- April
- Records since 2000
- 66
Melampsora caprearum
- Group
- Fungi
- Peak month
- August
- Records since 2000
- 475
Melampsora epitea
- Group
- Fungi
- Peak month
- May
- Records since 2000
- 561
Melampsora hypericorum
- Group
- Fungi
- Peak month
- July
- Records since 2000
- 419
Melampsora laricis-populina
- Group
- Fungi
- Peak month
- September
- Records since 2000
- 96
Melampsora lini
- Group
- Fungi
- Peak month
- June
- Records since 2000
- 90
Melampsora rostrupii
- Group
- Fungi
- Peak month
- April
- Records since 2000
- 138
Melampsoridium hiratsukanum
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 193
Melancholy Thistle
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 661
Melandrya caraboides
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 119
Melanella alba
- Group
- Molluscs
- Peak month
- August
- Records since 2000
- 210
Melanella polita
- Group
- Molluscs
- Peak month
- May
- Records since 2000
- 75
Melangyna arctica
- Group
- True flies
- Peak month
- July
- Records since 2000
- 55
Melangyna labiatarum
- Group
- True flies
- Peak month
- June
- Records since 2000
- 77
Melangyna quadrimaculata
- Group
- True flies
- Peak month
- March
- Records since 2000
- 93
Melanimon tibialis
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 306
Melanips opacus
- Group
- Bees, wasps and ants
- Peak month
- May
- Records since 2000
- 71
Melanochaeta pubescens
- Group
- True flies
- Peak month
- July
- Records since 2000
- 184
Melanogaster variegatus
- Group
- Fungi
- Peak month
- January
- Records since 2000
- 53
Melanohalea exasperatula
- Group
- Lichens
- Peak month
- April
- Records since 2000
- 214
Melanohalea laciniatula
- Group
- Lichens
- Peak month
- February
- Records since 2000
- 336
Melanoleuca bataillei
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 105
Melanoleuca brevipes
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 66
Melanoleuca cognata
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 221
Melanoleuca exscissa
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 105
Melanoleuca grammopodia
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 115
Melanoleuca melaleuca
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 109
Melanoleuca verrucipes
- Group
- Fungi
- Peak month
- May
- Records since 2000
- 100
Melanomma pulvis-pyrius
- Group
- Fungi
- Peak month
- April
- Records since 2000
- 172
Melanophyllum haematospermum
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 154
Melanothamnus harveyi
- Group
- Seaweeds and algae
- Peak month
- July
- Records since 2000
- 210
Melanotus castanipes
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 371
Melanotus villosus
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 461
Melasis buprestoides
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 114
Melaspilea lentiginosa
- Group
- Fungi
- Peak month
- December
- Records since 2000
- 183
Melaspilea lichen
- Group
- Fungi
- Peak month
- May
- Records since 2000
- 115
Melaspilea ochrothalamia
- Group
- Fungi
- Peak month
- April
- Records since 2000
- 89
Melastiza cornubiensis
- Group
- Fungi
- Peak month
- November
- Records since 2000
- 109
Melieria cana
- Group
- True flies
- Peak month
- June
- Records since 2000
- 83
Melieria crassipennis
- Group
- True flies
- Peak month
- June
- Records since 2000
- 224
Melieria omissa
- Group
- True flies
- Peak month
- July
- Records since 2000
- 230
Melieria picta
- Group
- True flies
- Peak month
- July
- Records since 2000
- 164
Meligethes atramentarius
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 69
Meligethes atratus
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 125
Meligethes flavimanus
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 68
Meligethes nigrescens
- Group
- Beetles
- Peak month
- July
- Records since 2000
- 347
Meligethes obscurus
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 85
Meligethes planiusculus
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 96
Meligethes ruficornis
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 64
Meligramma triangulifera
- Group
- True flies
- Peak month
- April
- Records since 2000
- 137
Melilotus officinalis
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 382
Melinda cognata
- Group
- True flies
- Peak month
- July
- Records since 2000
- 427
Melinda gentilis
- Group
- True flies
- Peak month
- July
- Records since 2000
- 60
Melinna cristata
- Group
- Worms (annelids)
- Peak month
- June
- Records since 2000
- 108
Melinna elisabethae
- Group
- Worms (annelids)
- Peak month
- May
- Records since 2000
- 414
Melinna palmata
- Group
- Worms (annelids)
- Peak month
- June
- Records since 2000
- 7,885
Melinnacheres steenstrupi
- Group
- Crustaceans
- Peak month
- October
- Records since 2000
- 78
Melinopterus sphacelatus
- Group
- Beetles
- Peak month
- April
- Records since 2000
- 1,037
Melita hergensis
- Group
- Crustaceans
- Peak month
- September
- Records since 2000
- 118
Melita palmata
- Group
- Crustaceans
- Peak month
- March
- Records since 2000
- 332
Melitta dimidiata
- Group
- Bees, wasps and ants
- Peak month
- June
- Records since 2000
- 157
Melitta haemorrhoidalis
- Group
- Bees, wasps and ants
- Peak month
- July
- Records since 2000
- 248
Melitta leporina
- Group
- Bees, wasps and ants
- Peak month
- July
- Records since 2000
- 244
Melitta tricincta
- Group
- Bees, wasps and ants
- Peak month
- August
- Records since 2000
- 359
Melobesia membranacea
- Group
- Seaweeds and algae
- Peak month
- May
- Records since 2000
- 258
Meloboris collector
- Group
- Bees, wasps and ants
- Peak month
- July
- Records since 2000
- 71
Melodious Warbler
- Group
- Birds
- Peak month
- September
- Records since 2000
- 529
Meloe brevicollis
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 187
Meloe mediterraneus
- Group
- Beetles
- Peak month
- October
- Records since 2000
- 134
Melosira varians
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 956
Melphidippella macra
- Group
- Crustaceans
- Peak month
- May
- Records since 2000
- 94
Membraneous felt lichen
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 2,536
Membraniporella nitida
- Group
- Bryozoans
- Peak month
- September
- Records since 2000
- 84
Membranoptera alata
- Group
- Seaweeds and algae
- Peak month
- August
- Records since 2000
- 1,481
Mendicula pygmaea
- Group
- Molluscs
- Peak month
- October
- Records since 2000
- 293
Menetus dilatatus
- Group
- Molluscs
- Peak month
- August
- Records since 2000
- 62
Mentha piperita
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 50
Mentha verticillata
- Group
- Flowering plants
- Peak month
- August
- Records since 2000
- 78
Mentha villosa
- Group
- Flowering plants
- Peak month
- September
- Records since 2000
- 104
Menzies' fiddleneck
- Group
- Flowering plants
- Peak month
- June
- Records since 2000
- 353
Meoneura flavifacies
- Group
- True flies
- Peak month
- July
- Records since 2000
- 119
Meoneura vagans
- Group
- True flies
- Peak month
- August
- Records since 2000
- 110
Meottomyces dissimulans
- Group
- Fungi
- Peak month
- January
- Records since 2000
- 129
Meredithia microphylla
- Group
- Seaweeds and algae
- Peak month
- August
- Records since 2000
- 378
Meridion circulare
- Group
- Seaweeds and algae
- Peak month
- April
- Records since 2000
- 1,162
Meridion constrictum
- Group
- Seaweeds and algae
- Peak month
- April
- Records since 2000
- 89
Merismodes anomala
- Group
- Fungi
- Peak month
- February
- Records since 2000
- 147
Merismodes fasciculata
- Group
- Fungi
- Peak month
- January
- Records since 2000
- 87
Merlin
- Group
- Birds
- Peak month
- October
- Records since 2000
- 26,138
Meromyza nigriventris
- Group
- True flies
- Peak month
- July
- Records since 2000
- 73
Meromyza pratorum
- Group
- True flies
- Peak month
- July
- Records since 2000
- 197
Meromyza rohdendorfi
- Group
- True flies
- Peak month
- July
- Records since 2000
- 62
Meromyza spec
- Group
- True flies
- Peak month
- July
- Records since 2000
- 60
Meruliopsis taxicola
- Group
- Fungi
- Peak month
- November
- Records since 2000
- 59
Merveille Du Jour
- Group
- Butterflies and moths
- Peak month
- October
- Records since 2000
- 1,428
Mesacanthion diplechma
- Group
- Roundworms
- Peak month
- May
- Records since 2000
- 78
Mesacmaea mitchellii
- Group
- Jellyfish, corals and anemones
- Peak month
- January
- Records since 2000
- 124
Mesodinium rubrum
- Group
- Microorganisms and protists
- Peak month
- May
- Records since 2000
- 214
Mesoneura opaca
- Group
- Bees, wasps and ants
- Peak month
- May
- Records since 2000
- 100
Mesophile Sunshiner
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 985
Mesopodopsis slabberi
- Group
- Crustaceans
- Peak month
- May
- Records since 2000
- 99
Mesopolobus aequus
- Group
- Bees, wasps and ants
- Peak month
- July
- Records since 2000
- 98
Mesopolobus dubius
- Group
- Bees, wasps and ants
- Peak month
- July
- Records since 2000
- 57
Mesopsocus immunis
- Group
- Other insects
- Peak month
- June
- Records since 2000
- 147
Mesoptychia gillmanii
- Group
- Liverworts
- Peak month
- November
- Records since 2000
- 86
Mesovelia furcata
- Group
- True bugs
- Peak month
- August
- Records since 2000
- 203
Meta bourneti
- Group
- Spiders
- Records since 2000
- 80
- Counties with records
- 12
Metacallophyllis spec
- Group
- Seaweeds and algae
- Peak month
- August
- Records since 2000
- 1,609
Metacoleroa dickiei
- Group
- Fungi
- Peak month
- April
- Records since 2000
- 76
Metacordyceps chlamydosporia
- Group
- Fungi
- Peak month
- January
- Records since 2000
- 144
Metalimnobia bifasciata
- Group
- True flies
- Peak month
- August
- Records since 2000
- 99
Metalimnobia quadrinotata
- Group
- True flies
- Peak month
- June
- Records since 2000
- 270
Metalinhomoeus longiseta
- Group
- Roundworms
- Peak month
- November
- Records since 2000
- 81
Metallic horned dung beetle
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 517
Metallus albipes
- Group
- Bees, wasps and ants
- Peak month
- October
- Records since 2000
- 68
Metallus lanceolatus
- Group
- Bees, wasps and ants
- Peak month
- September
- Records since 2000
- 183
Metallus pumilus
- Group
- Bees, wasps and ants
- Peak month
- September
- Records since 2000
- 60
Metalype fragilis
- Group
- Caddisflies
- Peak month
- July
- Records since 2000
- 234
Metaphoxus fultoni
- Group
- Crustaceans
- Peak month
- May
- Records since 2000
- 1,868
Metaphoxus simplex
- Group
- Crustaceans
- Peak month
- July
- Records since 2000
- 279
Metarhizium anisopliae
- Group
- Fungi
- Peak month
- January
- Records since 2000
- 139
Metarhizium spec
- Group
- Fungi
- Peak month
- January
- Records since 2000
- 71
Metatrichia floriformis
- Group
- Microorganisms and protists
- Peak month
- April
- Records since 2000
- 208
Metavermilia multicristata
- Group
- Worms (annelids)
- Peak month
- August
- Records since 2000
- 74
Metellina mengei
- Group
- Spiders
- Peak month
- June
- Records since 2000
- 815
Metellina merianae
- Group
- Spiders
- Peak month
- June
- Records since 2000
- 355
Metendothenia atropunctana
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 61
Methocha articulata
- Group
- Bees, wasps and ants
- Peak month
- June
- Records since 2000
- 59
Meticulous neoascia fly
- Group
- True flies
- Peak month
- May
- Records since 2000
- 333
Metidiocerus rutilans
- Group
- True bugs
- Peak month
- August
- Records since 2000
- 120
Metoecus paradoxus
- Group
- Beetles
- Peak month
- August
- Records since 2000
- 209
Metopa borealis
- Group
- Crustaceans
- Peak month
- August
- Records since 2000
- 63
Metopa rubrovittata
- Group
- Crustaceans
- Peak month
- June
- Records since 2000
- 55
Metopia argyrocephala
- Group
- True flies
- Peak month
- July
- Records since 2000
- 313
Metopia campestris
- Group
- True flies
- Peak month
- July
- Records since 2000
- 129
Metopina galeata
- Group
- True flies
- Peak month
- August
- Records since 2000
- 257
Metopina oligoneura
- Group
- True flies
- Peak month
- August
- Records since 2000
- 749
Metopobactrus prominulus
- Group
- Spiders
- Peak month
- July
- Records since 2000
- 103
Metopoplax ditomoides
- Group
- True bugs
- Peak month
- June
- Records since 2000
- 131
Metopoplax fuscinervis
- Group
- True bugs
- Peak month
- July
- Records since 2000
- 62
Metopsia clypeata
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 79
Metridia lucens
- Group
- Crustaceans
- Peak month
- November
- Records since 2000
- 3,549
Metriocnemus albolineatus
- Group
- True flies
- Peak month
- September
- Records since 2000
- 3,129
Metriocnemus eurynotus
- Group
- True flies
- Peak month
- December
- Records since 2000
- 486
Metriocnemus fuscipes
- Group
- True flies
- Peak month
- March
- Records since 2000
- 1,120
Metriocnemus picipes
- Group
- True flies
- Peak month
- March
- Records since 2000
- 440
Metriocnemus tristellus
- Group
- True flies
- Peak month
- March
- Records since 2000
- 50
Metylophorus nebulosus
- Group
- Other insects
- Peak month
- July
- Records since 2000
- 137
Metzgeria leptoneura
- Group
- Liverworts
- Peak month
- October
- Records since 2000
- 190
Metzneria lappella
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 133
Metzneria metzneriella
- Group
- Butterflies and moths
- Peak month
- June
- Records since 2000
- 165
Mew Gull
- Group
- Birds
- Peak month
- January
- Records since 2000
- 355,098
Mexican Aster
- Group
- Flowering plants
- Peak month
- September
- Records since 2000
- 2,055
Mexican Fleabane
- Group
- Flowering plants
- Peak month
- May
- Records since 2000
- 2,685
Mexican Mock Orange
- Group
- Flowering plants
- Peak month
- April
- Records since 2000
- 126
Meylan's pouchwort
- Group
- Liverworts
- Peak month
- February
- Records since 2000
- 223
Mezereon
- Group
- Flowering plants
- Peak month
- March
- Records since 2000
- 161
Micarea adnata
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 115
Micarea alabastrites
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 501
Micarea botryoides
- Group
- Lichens
- Peak month
- March
- Records since 2000
- 201
Micarea byssacea
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 1,193
Micarea cinerea
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 177
Micarea coppinsii
- Group
- Lichens
- Peak month
- November
- Records since 2000
- 207
Micarea doliiformis
- Group
- Lichens
- Peak month
- October
- Records since 2000
- 304
Micarea leprosula
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 332
Micarea micrococca
- Group
- Lichens
- Peak month
- April
- Records since 2000
- 376
Micarea myriocarpa
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 58
Micarea subnigrata
- Group
- Lichens
- Peak month
- August
- Records since 2000
- 53
Micarea viridileprosa
- Group
- Lichens
- Peak month
- October
- Records since 2000
- 264
Micaria dives
- Group
- Spiders
- Peak month
- July
- Records since 2000
- 60
Micaria pulicaria
- Group
- Spiders
- Peak month
- June
- Records since 2000
- 157
Micheli's ball-fruit
- Group
- Liverworts
- Peak month
- March
- Records since 2000
- 187
Micheli's Least Pouncewort
- Group
- Liverworts
- Peak month
- April
- Records since 2000
- 2,247
Micrambe ulicis
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 469
Micrargus herbigradus
- Group
- Spiders
- Peak month
- August
- Records since 2000
- 97
Micrargus subaequalis
- Group
- Spiders
- Peak month
- June
- Records since 2000
- 54
Micrasterias truncata
- Group
- Seaweeds and algae
- Peak month
- July
- Records since 2000
- 89
Microbotryum lychnidis-dioicae
- Group
- Fungi
- Peak month
- May
- Records since 2000
- 370
Microbotryum pinguiculae
- Group
- Fungi
- Peak month
- June
- Records since 2000
- 58
Microbotryum silenes-dioicae
- Group
- Fungi
- Peak month
- May
- Records since 2000
- 218
Microbotryum silenes-inflatae
- Group
- Fungi
- Peak month
- May
- Records since 2000
- 90
Microbotryum stellariae
- Group
- Fungi
- Peak month
- June
- Records since 2000
- 217
Microbotryum violaceum
- Group
- Fungi
- Peak month
- May
- Records since 2000
- 114
Microcalicium lichen
- Group
- Lichens
- Peak month
- May
- Records since 2000
- 56
Microcara testacea
- Group
- Beetles
- Peak month
- May
- Records since 2000
- 567
Microchrysa cyaneiventris
- Group
- True flies
- Peak month
- June
- Records since 2000
- 418
Microclymene tricirrata
- Group
- Worms (annelids)
- Peak month
- July
- Records since 2000
- 596
Microcosmus claudicans
- Group
- Sea squirts
- Peak month
- June
- Records since 2000
- 140
Microdeutopus anomalus
- Group
- Crustaceans
- Peak month
- June
- Records since 2000
- 526
Microdeutopus gryllotalpa
- Group
- Crustaceans
- Peak month
- September
- Records since 2000
- 76
Microdeutopus versiculatus
- Group
- Crustaceans
- Peak month
- May
- Records since 2000
- 288
Microdiplodia narthecii
- Group
- Fungi
- Peak month
- September
- Records since 2000
- 54
Microdon analis
- Group
- True flies
- Peak month
- May
- Records since 2000
- 101
Microdon devius
- Group
- True flies
- Peak month
- June
- Records since 2000
- 66
Microdon mutabilis
- Group
- True flies
- Peak month
- May
- Records since 2000
- 163
Microdon myrmicae
- Group
- True flies
- Peak month
- May
- Records since 2000
- 66
Microglossum olivaceum
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 438
Microjassa cumbrensis
- Group
- Crustaceans
- Peak month
- July
- Records since 2000
- 433
Microlaimus conothelis
- Group
- Roundworms
- Peak month
- May
- Records since 2000
- 52
Microlaimus marinus
- Group
- Roundworms
- Peak month
- May
- Records since 2000
- 52
Microlaimus monstrosus
- Group
- Roundworms
- Peak month
- May
- Records since 2000
- 51