Opisthotropis jacobi

Opisthotropis jacobi, also known commonly as the Chapa mountain keelback, Jacob's mountain stream keelback, and Jacob's stream snake, is a species of snake in the subfamily Natricinae of the family Colubridae. The species is native to Vietnam and China.

Etymology
The specific name, jacobi, is in honor of German entomologist Arnold F. V. Jacobi.

Geographic range
O. jacobi is found in extreme northern Vietnam and in adjacent Yunnan Province, China.

Habitat
The preferred natural habitats of O. jacobi are forest and streams, at altitudes of 500 –.

Description
O. jacobi may attain a total length (including tail) of 54 cm. Dorsally, it is uniformly shiny black. Ventrally, it is also shiny black but with light-edged ventrals and subcaudals. The dorsal scales are smooth, and arranged in 15 rows throughout the length of the body.

Diet
O. jacobi preys upon earthworms, freshwater shrimp, fishes, and frogs and their tadpoles.

Reproduction
O. jacobi is oviparous.