Retusidae

Taxobox
name = Retusidae


image_caption = "Retusa obtusa"
image_width = 120px
regnum = Animalia
phylum = Mollusca
classis = Gastropoda
subclassis = Orthogastropoda
superordo = Heterobranchia
ordo = Opisthobranchia
subordo = Cephalaspidea
superfamilia = Philinoidea
familia = Retusidae
familia_authority = Thiele, 1926
subdivision_ranks = Genera
subdivision = See text.

Retusidae is a family of small sea snails, marine opisthobranch gastropod mollusks. They are headshield slugs, in the suborder Cephalaspidea.

Description

The shells are small and cylindrical, with a spire that may vary from slightly elevated to sunken. The columella is smooth or with a weak plait. The surface is smooth or with weak spiral striations.

There is no gill, radula or operculum.

Genera within the family Retusidae

* "Coleophysis"
* "Cylichnina" Monterosato, 1884
* "Pyrunculus" Pilsbry, 1895
* "Retusa" T. Brown, 1827
* "Volvulella" Newton, 1891
* "Rhizorus" Mountfort, 1810

References

*
* Powell A. W. B., "New Zealand Mollusca", William Collins Publishers Ltd, Auckland, New Zealand 1979 ISBN 0-00-216906-1