Atractus modestus, commonly known as the modest ground snake (Spanish: tierrera modesta or culebra tierrera modesta), is a species of snake in the family Colubridae.
Description
Atractus modestus is a small, semi-fossorial snake with a round head similar in width to the neck, small eyes, and a robust body. It has 17 dorsal scale rows at mid-body, no preocular scale, and a short loreal scale. The dorsal coloration is uniform blackish to purplish brown. The belly is bright yellow in adults and pale yellowish white in juveniles. Juveniles have a contrasting yellow neck band. Males can grow to 27.3 cm (10.7 in) and females to 32.8 cm (12.9 in) in snout–vent length.
Taxonomy
The species was described by George Albert Boulenger in 1894. The genus name Atractus is a latinization of the Greek word άτρακτος ("spindle"), likely referring to the snakes' uniform body width and narrow tail. The specific epithet modestus is Latin for "modest," probably referring to the snake's plain, uniform dorsal coloration.
Distribution and habitat
Atractus modestus is endemic to the western foothills of the Andes in Ecuador, with a distribution area of approximately 9,768 km². It has been reported at elevations ranging from 1,019 m to 2,560 m above sea level. The species inhabits old-growth to moderately disturbed evergreen montane and foothill forests, as well as crops, pastures with scattered trees, and rural gardens near forest borders.
Behavior and ecology
The modest ground snake is semi-fossorial and nocturnal. It is usually seen moving on the forest floor or crossing dirt roads and trails during warm, cloudy nights. When inactive, individuals are typically found hidden under logs. Its primary defense is cryptic coloration; when handled, it may try to flee or produce a musky, distasteful odor. There is an unpublished photographic record of an individual preying upon an earthworm.
Conservation status
Atractus modestus is listed as Vulnerable on the IUCN Red List. Its extent of occurrence is smaller than 20,000 km², and its habitat is declining in extent and quality due to deforestation. Approximately 42% of the species' potential distribution area has already been converted to human settlements and agricultural fields. Remaining populations are severely fragmented, with few localities in protected areas.
