Scissurelloidea with the slit and its selenizone at the periphery, instead of the shoulder in Scissurellidae. Shell minute, « trochoid, thin, shoulder rounded or angulated. Sculpture variable: axials only, predominantly axials, reticulate; no spiral keel(s) on base. Protoconch sculpture smooth,flocculent, reticulate; varix if present not connecting to embryonic cap; aperture sinusoid or curved convex. Umbilicus without carina or keel, in profile describing smooth curve with base of shell. No brood pouch. Slit open, selenizone at periphery, start of selenizone on teleoconch variable, keels of moderate height. Operculum coiled with central nucleus. » – D. Geiger: “Phylogenetic assessment of characters proposed for the generic classification of Recent Scissurellidae (Gastropoda : Vetigastropoda)” Molluscan Research vol.23(1), Clayton 2003, p.42.
 

Shell rather large for the family, « Trochiform. Spire prominent. Slit deep, open. Slit and selenizone at periphery or slightly above; keels usually prominent, at right angle to shell axis. Umbilicus open, often very constricted, no carina. Protoconch smooth or flocculent, varix absent or faint, not forming bridge to nucleus of embryonic shell. » – D. Geiger: op. cit. p.43. Operculum multispiral.