Troschel, 1863
Shell convolute, no spire visible in mature shells; robust, polished, enveloped by mantle lobes in active animals. Aperture is long and narrow. No operculum. Animal without snout. Eversible proboscis used to feed on compound ascidians.
Source: Hayward et al., 1990.
The following subtaxa of this family occur in the region:
Genus Trivia
Trivia arctica
Trivia monacha