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Cypraeoidea
Cypraeoidea, the cowries and cowry allies, is a superfamily of sea snails, marine gastropods included in the clade Littorinimorpha. This superfamily had been called Cypraeacea and was named by Rafinesque in 1815. ==Shell description== This superfamily of sea snails have adult shells which do not look like typical gastropod shells because the spire of the shell is not visible in adults, instead the shells are: often quite rounded in shape, varying from globular to elongate, and with a long, very narrow, aperture which is sometimes toothed. The snails in these families have no operculum. The shells of almost every species in this superfamily are very smooth and shiny, and this is because in the living animal, the shell is nearly always fully covered with the mantle. The largest known fossil cowry was ''Gisortia gigantiea'' Munster, 1828 which reached a length of 350mm. The largest modern cowry is the Atlantic Deer Cowry (''Macrocypraea cervus'') at up to 190mm. The largest known cowry from any extant subfamily or genus was the Australian cowry ''Zoila (Gigantocypraea) gigas'' (McCoy, 1867) at about 247mm.〔(Thomas A. Darragh, A revision of the Australian fossil species of Zoila (Gastropoda, Cypraeidae); Memoirs of Museum Victoria 68: 1-28 (2011) )〕
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