FAMILY TRYPETESIDAE STEBBING, 1910

Diagnosis: Monophyletic in molecular analyses. Females with thin, unclear opercular bars, comb collar reduced, operculum without rows of massive multifid scales; protopod of mouth cirri unsegmented, mouth appendages reduced in size; three pairs of uniramous terminal cirri; caudal appendages absent; thoracic lappets reduced; intestine without anus. Dwarf males with a pair of lobes at the base of attachment process; posterior end without apertural slit. Inhabit columella of gastropod shells occupied by hermit crabs.

Tomlinsonia Turquier, 1985 (two species)

Trypetsa Norman, 1903 (five species)