The abdomen has seven sternal segments and the antennae are filamentous rather than club-shaped, which distinguishes it from all other members of the Dermestidae.

It resembles a larva, and though it is free-living and has legs and antennae, it lacks elytra and hind wings.

Once T. contractus has reached sexual maturity, the female produces a sex pheromone which attracts the male.

It feeds on fabrics such as wool and silk, and dried animal matter such as fur, feathers, and skin.

[6] The beetle is usually found in dark corners of human structures, such as drawers, cupboards, and museum displays.