Pilargis mirasetis Fauchald, 1972 is redescribed and referred to a new genus
Santelma. These species are tentatively referred to the family Nautiliniellidae that heretofore has included commensals of bivalve molluscs. One species,
Laubierus mucronatus, was dissected from a mussel during its collection, but the other three species were not associated with bivalves during the sorting process. Two genera and species,
Miura spinosa and
Santelma miraseta come from the eastern Pacific, while
Laubierus mucronatus and
Flascarpia alvinae come from cold-seep communities on the Florida Escarpment. The genera presently assigned to the Nautiliniellidae are heterogeneous and diverse. These genera are compared with previously described nautiliniellids and with the closely related family Antonbruunidae. Of the 8 genera of Nautiliniellidae, 7 are monotypic, with the only known species of Antonbruunidae,
Antonbruunia, left in this family.