Shore life · La Saladita, Guerrero

Halloween Crab

Hartnollius quadratus

Spanish: Cangrejo de tierra de patas rojas

Halloween Crab (Hartnollius quadratus) is a species recorded near La Saladita, Guerrero, Mexico, with 30 research-grade iNaturalist observations within about 50 km of La Saladita (the survey box also takes in Zihuatanejo, Ixtapa and Troncones).

TaxonomyMalacostraca › Decapoda › Gecarcinidae

Local records30 research-grade observations within about 50 km of La Saladita (the survey box also takes in Zihuatanejo, Ixtapa and Troncones)

Global records3,336 on iNaturalist

Most recent records2025 – 2026

Months of the 8 most recent records

JanFebMarAprMayJunJulAugSepOctNovDec

Recent local sightings

2026-05-20 — iNaturalist observation
2026-05-15 — iNaturalist observation
2026-05-15 — iNaturalist observation
2026-02-01 — iNaturalist observation
2025-12-16 — iNaturalist observation
2025-12-08 — iNaturalist observation

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

Cite as: “Halloween Crab (Hartnollius quadratus) at La Saladita”, La Saladita Field Guide, lasaladita.com/species/hartnollius-quadratus/, updated 2026-11-08. 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.