Reptiles & amphibians · La Saladita, Guerrero

Black-necked Garter Snake

Thamnophis cyrtopsis

Spanish: Culebra de agua

Black-necked Garter Snake (Thamnophis cyrtopsis)
Photographed by julieth24 on iNaturalist

Thamnophis cyrtopsis, the blackneck garter snake, is a species of garter snake of the genus Thamnophis. It is native to the southwestern United States, Mexico and Guatemala, and can be found in a wide range of different habitats, often near water sources. Most often recorded in Dec.

TaxonomyReptilia › Squamata › Colubridae
Local records1 research-grade observation within about 50 km of La Saladita (the survey box also takes in Zihuatanejo, Ixtapa and Troncones)
Global records4,416 on iNaturalist
Recorded here2019 – 2019
Months recorded near La Saladita
JanFebMarAprMayJunJulAugSepOctNovDec
Recent local sightings

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

Cite as: “Black-necked Garter Snake (Thamnophis cyrtopsis) at La Saladita”, La Saladita Field Guide, lasaladita.com/species/thamnophis-cyrtopsis/, 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.