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Species · Molluscs

Horse-mussel

Modiolus modiolus

3,571Records since 2000
SeptemberPeak month
20Counties with records

When it is recorded

Jan84
Feb217
Mar143
Apr140
May202
Jun305
Jul427
Aug678
Sep831
Oct165
Nov123
Dec62

GBIF records by month, 2000–2025 (all years combined).

Where it is recorded

#CountyNationRecordsShare
1Argyll and Bute Scotland134
2Highland Scotland70
3Shetland Islands —20
4Ards and North Down Northern Ireland17
5Newry, Mourne and Down Northern Ireland15
6Orkney Islands Scotland9
7Cambridgeshire England8
8Inverclyde Scotland8
9Causeway Coast and Glens Northern Ireland6
10North Ayrshire Scotland6
11East Lothian Scotland5
12Mid and East Antrim Northern Ireland5
13Norfolk England3
14Na h-Eileanan Siar Scotland3
15Plymouth England2
196 England1,636 Scotland257 Wales504 Northern Ireland1 Isle of Man

Records per county (GADM level 2) and per nation; one record can count towards several areas. 20 counties in all.

About this species

Records since 2000
3,571
Peak month
September
Counties with records
20
Scientific name
Modiolus modiolus
Also known as
horse mussel
Group
Molluscs
NBN Atlas records since 2000
2,606
Most recorded in
Argyll and Bute, Highland
Conservation designations
Biodiversity List – Northern Ireland, GB Red List (2001 IUCN criteria)
Kingdom
Animalia
Phylum
Mollusca
Class
Bivalvia
Order
Mytilida
Family
Mytilidae
Genus
Modiolus
Name with authority
Modiolus modiolus (Linnaeus, 1758)
Described
1758
Contributing datasets
55

Sources: GBIF occurrence data (CC0 / CC BY), JNCC Taxon Designations (OGL), NBN Atlas (open licences), Wikidata (CC0) · Wikidata Q686276 · GBIF 2285656