Scissurellidae Gray, 1847

Diagnosis. Shell small (to 0.54–3.1 mm); without nacre; usually with slit or foramen (absent in Coronadoa); slit well above periphery; radula with serrated rachidian tooth, lateral teeth 1–3 similar, lateral tooth 4 reduced, hook-shaped, lateral tooth 5 enlarged by broadening, marginal teeth spoon shaped. Operculum thin, round, multispiral, with central nucleus.