#4829 · 🐌 snails, slugs & other molluscs
Atlantic Ribbed Mussel
Geukensia demissa
7 photos from iNaturalist (Creative Commons) · credits & licences
what is it?
Geukensia demissa is a species of mussel, a marine bivalve mollusk in the family Mytilidae, the true mussels. This species is native to the Atlantic coast of North America. The common names for this species include ribbed mussel , Atlantic ribbed marsh mussel and ribbed horsemussel . However, the common name ribbed mussel is also used for the Southern Hemisphere mussel Aulacomya atra . The appearance of the shell is grooved and oval in shape. The interior of this...
base stats
Bars compare against all animals on log scales: up to 300,000 Dutch and 600,000 worldwide sightings (the most-seen species), 150 t (blue whale), 30 m and 400 years (Greenland shark).
fun facts
- No confirmed wild sightings in the Netherlands on iNaturalist: you'd have to travel for this one.
- 8,337 observations worldwide on iNaturalist.
- Scientifically named by Lewis Weston Dillwyn in 1817 (209 years ago).
fact sheet
- English
- Atlantic Ribbed Mussel
- scientific name
- Geukensia demissa
- class
- Bivalvia
- order
- Mytilida
- family
- Mytilidae
- sightings in NL
- 0
- sightings worldwide
- 8,337
- GBIF records in NL
- 0
- weight
- —
- length
- —
- lifespan
- —
- named
- 1817 by Lewis Weston Dillwyn
relatives· Mytilidae
Sources: iNaturalist taxon 81608, Wikidata Q5554808, GBIF 2285800, Wikipedia (EN), Wikipedia (NL). Intro text from Wikipedia (CC BY-SA 4.0).Updated 2026-10-24.