Trachischium

Trachischium is a genus of snakes, known commonly as slender snakes or worm-eating snakes, in the subfamily Natricinae of the family Colubridae. The genus is endemic to Asia.

Geographic range
Species of the genus Trachischium are found through montane regions of the countries of Bangladesh, Bhutan, China, India, and Nepal.

Description
Snakes of the genus Trachischium exhibit the following characters: head not distinct from neck; eye small, with vertically subelliptic pupil; nostril between two small nasals; prefrontals sometimes united; body cylindrical; dorsal scales smooth, in 13 or 15 rows, without apical pits; ventrals rounded; tail short; subcaudals divided; maxillary teeth 18–20, subequal; posterior mandibular teeth shorter than anterior; hypapophyses developed throughout vertebral column.

Species
There are 7 species in the genus Trachischium which are recognized as being valid.
 * Trachischium apteii Bhosale, Gowande, & Mirza, 2019
 * Trachischium fuscum (Blyth, 1854) – blackbelly worm-eating snake, Darjeeling slender snake
 * Trachischium guentheri Boulenger, 1890 – Günther's worm-eating snake, rosebelly worm-eating snake
 * Trachischium laeve Peracca, 1904 – olive Oriental slender snake
 * Trachischium monticola (Cantor, 1839) – mountain worm-eating snake
 * Trachischium sushantai Raha, S. Das, Bag, Debnath & Pramanick, 2018 – Sushanta's worm-eating snake
 * Trachischium tenuiceps (Blyth, 1854) – yellowbelly worm-eating snake

Nota bene: A binomial authority in parentheses indicates that the species was originally described in a genus other than Trachischium.