Caymanabyssia MOSKALEV
Type species: Caymanabyssia spina MOSKALEV, 1976 by original designation.
Diagnosis: Shell small (to 4 mm), white, translucent, low in profile. Protoconch with minute columnar prisms. Teleoconch sculpture of conical projections in diagonally reticulate pattern. Rachidian, lateral radular teeth degenerate, cusps lacking, rachidian tooth subquadrate. Single gill leaflet on left side, several on right side of body. Two epipodial tentacles on each side of body, outer tentacle blunt, cylindrical, inner tentacle long, filamentous.
Remarks: Following Moskalev's (1976) description of Caymanabyssia and its hadal type species, Marshall (1986) added two species from the upper bathyal zone of New Zealand, substantially expanding both the geographic and bathymetric range of this genus. McLean (1991) further added an abyssal species from the Gorda Ridge off northern California, as well as the subgenus Dictyabyssia to accommodate an additional abyssal species from the East Pacific Rise. All share the distinctive radular morphology of the genus, but the monotypic Dictyabyssia lacks the conical teleoconch sculpture present in all members of Caymanabyssia sensu stricto.