Shore life · La Saladita, Guerrero

mouthless crab

Cardisoma crassum

Spanish: Cangrejo Cajo

Cardisoma crassum, known as the mouthless crab, is a species of terrestrial crab found in the coastal tropical eastern Pacific from Baja California to Peru. It has a purplish-blue shell, red legs and white main pincer. Cardisoma crassum is common among mangrove roots, where it builds its burrow. It also occasionally occurs on the driest part of the channel banks and flats".

TaxonomyMalacostraca › Decapoda › Cardisomatidae

Local records34 research-grade observations within about 50 km of La Saladita (the survey box also takes in Zihuatanejo, Ixtapa and Troncones)

Global records2,698 on iNaturalist

Most recent records2026 – 2026

Months of the 8 most recent records

JanFebMarAprMayJunJulAugSepOctNovDec

Recent local sightings

2026-08-24 — observation by mora17918
2026-08-24 — observation by mora17918
2026-07-31 — observation by mora17918
2026-06-20 — observation by edgar-maldonado
2026-06-20 — observation by edgar-maldonado
2026-06-20 — observation by edgar-maldonado

Interactive card with more photos, sounds and similar species Shore life guide iNaturalist Wikipedia

Cite as: “mouthless crab (Cardisoma crassum) at La Saladita”, La Saladita Field Guide, lasaladita.com/species/cardisoma-crassum/, updated 2026-09-26. Observation counts and months come from iNaturalist research-grade records within about 50 km of 17.8375°N, 101.7606°W (the survey box also takes in Zihuatanejo, Ixtapa and Troncones); summary text from Wikipedia where present.