#4560 · 🦀 crabs & other crustaceans
Squareback Marsh Crab
Armases cinereum
🦀 Crabs & other crustaceans 📍 outside Europe
📍 North Carolina, US
📍 N Bald Head Wynd, Bald Head Island, NC, US
📍 Wakulla County, FL, USA
📍 Loggerhead Rd, Kure Beach, NC, US
10 photos from iNaturalist (Creative Commons) · credits & licences
- 1. © John Fones · CC0
- 2. © Tom Austin · CC BY-NC 4.0
- 3. © ktcage · CC BY-NC 4.0
- 4. © Tom Austin · CC BY-NC 4.0
- 5. © Tom Austin · CC BY-NC 4.0
- 6. © Peggy Romfh · CC BY-NC 4.0
- 7. North Carolina, US:© no rights reserved · CC0
- 8. N Bald Head Wynd, Bald Head Island, NC, US:© Broughton Taylor · CC BY-NC 4.0
- 9. Wakulla County, FL, USA:© Jared Gorrell · CC BY-NC 4.0
- 10. Loggerhead Rd, Kure Beach, NC, US:© Samuel Askew · CC BY-NC 4.0
what is it?
Armases cinereum , known generally as the squareback marsh crab or wharf crab , is a species of true crab in the family Sesarmidae. It is found in Western Atlantic Ocean.
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.
- 6,125 observations worldwide on iNaturalist.
- Scientifically named by Louis Augustin Guillaume Bosc in 1801 (225 years ago).
fact sheet
- English
- Squareback Marsh Crab
- scientific name
- Armases cinereum
- class
- Malacostraca
- order
- Decapoda
- family
- Sesarmidae
- sightings in NL
- 0
- sightings worldwide
- 6,125
- GBIF records in NL
- 0
- weight
- —
- length
- —
- lifespan
- —
- named
- 1801 by Louis Augustin Guillaume Bosc
Sources: iNaturalist taxon 122246, Wikidata Q6497777, GBIF 2225741, Wikipedia (EN), Wikipedia (NL). Intro text from Wikipedia (CC BY-SA 4.0).Updated 2026-10-24.