Genus Timorichthys

Timorichthys differs from all other bythitid genera in having the anus positioned midway between the snout tip and the anal-fin origin. 

Diagnostic characters: Anus positioned about midway between snout and origin of anal fin; body strongly compressed, without scales; head small, mouth almost vertical with small teeth in jaws, on vomer and palatines; dorsal-fin rays 74–80; anal-fin rays 46–52; pectoral-fin rays 10–12; precaudal vertebrae 16–22; total vertebrae 52–62; first gill arch with 6–14 long rakers; and otolith with small centrally placed sulcus.

Timorichthys also has dorsal and anal fins joined to the caudal fin, a single pelvic-fin ray and the copulary organ as part of the fleshy genital hood with the penis present as a small soft papilla without pseudoclaspers that further places it in the subfamily Bythitinae.

The genus contains two species, with Timorichthys disjunctus, known only from a single male specimen collected at a depth of 392 m in the Timor Sea off northwestern Australia.