Bagrichthys obscurus

Bagrichthys obscurus has a fusiform body and reaches a standard length of 24.7 cm (9.7 in). Its dorsal fin contaosn a single, compartively short spine and 7 soft rays while the anal fin has between 7 and 10 soft rays. This species has a very small mouth and a highly reduced number of teeth. The adipose fin is short based. The males have genital papillae which reach the base of the first ray of the anal fin. The colour of this fish is plain brown with no plain markings.

Bagrichthys obscurus is found in Indochina, where it occurs in the Chao Phraya, Bang Pakong and Mekong river systems, being recorded from Thailand, Cambodia, Loas and Vietnam. This catfish is found in the larger tributaries of the Mekong, in turbid, slow flowing waters.

Bagrichthys obscurus belongs to the genus Bagrichthys, a name which suffixes ichthys, meaning "fish", onto Bagrus, the genus the type species, B. hypselopterus was originally placed in. The specific name, obscurus is Latin, meaning "dark", although Ng said it meant "indistinct", an allusion to the plain brown colour of this catfish.