The narrowtail catshark is very elongated both as an adult and as a juvenile, growing to a length of about 35 cm (14 in).

The dorsal surface and flanks are light grey or tan, spotted with white.

Juveniles have six to nine light brown saddle-shaped markings dorsally, but these fade in adulthood.

It occupies the edge of the continental shelf and the upper parts of the slope, its depth range being between about 190 and 410 m (620 and 1,350 ft).

[2] The narrowtail catshark is a demersal species, cruising along close to the seabed and feeding mainly on small fish and cephalopods.