Electrogena lateralis
- Group
- Mayflies
- Peak month
- April
- Records since 2000
- 452
Species recorded in Powys
1,168 species
Powys — county
Nemoura avicularis
- Group
- Stoneflies
- Peak month
- October
- Records since 2000
- 449
Parrot feather watermilfoil
- Group
- Flowering plants
- Peak month
- September
- Records since 2000
- 449
Nitzschia capitellata
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 448
Zorochros dermestoides
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 447
Dinocras cephalotes
- Group
- Stoneflies
- Peak month
- April
- Records since 2000
- 442
Aloconota cambrica
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 440
Navicula capitatoradiata
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 437
Lemanea fluviatilis
- Group
- Seaweeds and algae
- Peak month
- July
- Records since 2000
- 432
Fragilaria bidens
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 427
Glutinoglossum glutinosum
- Group
- Fungi
- Peak month
- October
- Records since 2000
- 425
Synedra radians
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 424
Pinnularia subcapitata
- Group
- Seaweeds and algae
- Peak month
- May
- Records since 2000
- 419
Gomphonema angustatum
- Group
- Seaweeds and algae
- Peak month
- April
- Records since 2000
- 418
Brachysira neoexilis
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 414
Eunotia subarcuatoides
- Group
- Seaweeds and algae
- Peak month
- May
- Records since 2000
- 410
Crossocalyx hellerianus
- Group
- Liverworts
- Peak month
- September
- Records since 2000
- 397
Nitzschia pusilla
- Group
- Seaweeds and algae
- Peak month
- April
- Records since 2000
- 380
Disc granular lichen
- Group
- Lichens
- Peak month
- October
- Records since 2000
- 368
Five-Spot Ladybird
- Group
- Beetles
- Peak month
- August
- Records since 2000
- 359
Synedra bilunaris
- Group
- Seaweeds and algae
- Peak month
- April
- Records since 2000
- 353
Simulium cryophilum
- Group
- True flies
- Peak month
- April
- Records since 2000
- 351
Nitzschia media
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 347
Staurosirella pinnata
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 333
Eunotia incisa
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 327
Simulium variegatum
- Group
- True flies
- Peak month
- September
- Records since 2000
- 322
Nitzschia perminuta
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 321
Navicula subatomoides
- Group
- Seaweeds and algae
- Peak month
- April
- Records since 2000
- 314
Syzygiella autumnalis
- Group
- Liverworts
- Peak month
- February
- Records since 2000
- 312
Navicula saprophila
- Group
- Seaweeds and algae
- Peak month
- May
- Records since 2000
- 308
Leuctra moselyi
- Group
- Stoneflies
- Peak month
- September
- Records since 2000
- 307
Himantidium minus
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 300
Tipula montium
- Group
- True flies
- Peak month
- September
- Records since 2000
- 298
Gomphonema truncatum
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 297
Fragilaria tenera
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 285
Achnanthes lauenburgiana
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 281
Hydrosmecta longula
- Group
- Beetles
- Peak month
- August
- Records since 2000
- 281
Paraleptophlebia submarginata
- Group
- Mayflies
- Peak month
- April
- Records since 2000
- 273
Double line
- Group
- Butterflies and moths
- Peak month
- July
- Records since 2000
- 264
Hesperocodon hederaceus
- Group
- Flowering plants
- Peak month
- July
- Records since 2000
- 264
Adlafia suchlandtii
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 234
Navicula menisculus
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 231
Psammothidium helveticum
- Group
- Seaweeds and algae
- Peak month
- April
- Records since 2000
- 230
Ground beetle
- Group
- Beetles
- Peak month
- June
- Records since 2000
- 228
Surirella angusta
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 223
Pennate undif
- Group
- Microorganisms and protists
- Peak month
- September
- Records since 2000
- 218
Nitzschia gracilis
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 214
Navicula angusta
- Group
- Seaweeds and algae
- Peak month
- September
- Records since 2000
- 211