Ringiculidae is the only family within the superfamily Ringiculoidea.
The shells of species in this family superficially resemble minute versions of the shells of the Cassinae.
Characteristics
(Original description in German) The shell is generally spherical, though in rare cases, it can be an elongated oval shape. Its aperture is crescent-shaped and lacks both a siphonal canal and a notch. The outer lip is typically thickened and reflected, while the columella is folded. This family is distinguished from Marginella and related genera by the absence of a notch at the base of the aperture; it differs from the Bullidae by its thickened outer lip.
↑Bouchet P. & Rocroi J.-P. (Ed.); Frýda J., Hausdorf B., Ponder W., Valdes A. & Warén A. 2005. Classification and nomenclator of gastropod families. Malacologia: International Journal of Malacology, 47(1-2). ConchBooks: Hackenheim, Germany. ISBN3-925919-72-4. ISSN0076-2997. 397 pp. http://www.vliz.be/Vmdcdata/imis2/ref.php?refid=78278
Vaught, K.C. (1989). A classification of the living Mollusca. American Malacologists: Melbourne, FL (USA). ISBN0-915826-22-4. XII, 195 pp.
Bouchet P., Rocroi J.P., Hausdorf B., Kaim A., Kano Y., Nützel A., Parkhaev P., Schrödl M. & Strong E.E. (2017). Revised classification, nomenclator and typification of gastropod and monoplacophoran families. Malacologia. 61(1-2): 1-526