IUCN threat status:

Critically Endangered (CR)

Comprehensive Description

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Description

This salamander measures from 39.1-53.3mm SVL in adult males and 44.5-53.0mm SVL in adult females. Bradytriton silus has a robust, cylindrical body with a short, stocky tail (mean SL/tail length of 1.4). The head is broad and rounded, with a short, broad snout, and there is no clearly defined neck. Nostrils are small. The adetoglossal tongue has a distinct small pad. Eyes are moderately sized and in dorsal view protrude slightly beyond the jaw margin. Adult males have 3-8 premaxillary teeth, while females have 6-10. The row of maxillary teeth extends to a point nearly posterior to the eye. A single, curved row of vomerine teeth is present. Posterior vomerine teeth are present in two bilateral patches. A well developed gular fold and large sublingual fold are also present. Limbs are short and thin, with small syndactylous hands and feet that lack subdigital pads. Digits are mostly cartilaginous, including most of the terminal phalanges, with only the proximal phalanx of the longest finger and toe consistently well-ossified. Distinct post-iliac glands are present. The short tail has a marked basal constriction. The tail is also strongly tapered and laterally compressed, with a prominent dorsal glandular ridge running along its length.

Females have shorter snouts and poorly developed labial protuberances, while males have prominent, wide labial protuberances and large, hooked premaxillary teeth extending through or under the lip. Males also have mental glands but they are not visible externally.

The dorsal coloration is reddish brown, extending halfway down the lateral surfaces. The head is nearly black, having black cheeks flecked with white. The lower flanks and the sides of the tail are also black with white speckling. Legs are brown proximally, shading into black with white flecks distally. The feet are black with white speckling. Eyes are chestnut brown.

This species is the sole member of its genus. The generic name Bradytriton refers to the slow and lethargic movement of this salamander. The specific name silus is Latin for pug-nosed, referring to the short, broad, wide snout.

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