Reptiles & amphibians · La Saladita, Guerrero

Mexican West Coast Boa Constrictor

Boa sigma

Spanish: Boa mexicana del Pacífico

Boa sigma, known commonly as the Mexican west coast boa constrictor, is a species of snake in the family Boidae. The species is endemic to western Mexico. Boa sigma has previously been regarded as conspecific with Boa constrictor, and later with Boa imperator; however, in 2016, it was suggested on genetic grounds that Boa sigma should be regarded as a separate species.

TaxonomyReptilia › Squamata › Boidae

Local records19 research-grade observations within about 50 km of La Saladita (the survey box also takes in Zihuatanejo, Ixtapa and Troncones)

Global records2,095 on iNaturalist

Most recent records2021 – 2026

Months of the 8 most recent records

JanFebMarAprMayJunJulAugSepOctNovDec

Recent local sightings

2026-04-03 — observation by principeroqueta
2025-11-18 — observation by horchxt4
2025-07-19 — observation by adrian_mora
2023-09-30 — observation by raulramirez
2022-11-17 — observation by lauren1865
2022-02-20 — observation by sheilaryan

Interactive card with more photos, sounds and similar species Reptiles & amphibians guide iNaturalist Wikipedia

Cite as: “Mexican West Coast Boa Constrictor (Boa sigma) at La Saladita”, La Saladita Field Guide, lasaladita.com/species/boa-sigma/, 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.