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Fossarina
''Fossarina'' is a genus of sea snails, marine gastropod molluscs in the family Trochidae, the top shells. The genus ''Fossarina'' was moved from the family Fossariidae to the newly created subfamily Fossarininae within the family Trochidae by Williams et al. in 2010.〔Williams S. T., Donald K. M., Spencer H. G. & Nakano, T. (2010). "Molecular systematics of the marine gastropod families Trochidae and Calliostomatidae (Mollusca: Superfamily Trochoidea)". ''Molecular Phylogenetics and Evolution'' 54(3): 783-809. 〕 ==Description== The shell is auriform, a little depressed and narrowly umbilicated. The spire is short. The oval aperture is oblique. The lips are rounded. The operculum is multispiral.〔(Tryon (1887), Manual of Conchology IX – Solariidae (by William B. Marshall), Ianthinidae, Trichotropidae, Scalariidae, Cerithiidae, Rissoidae, Littorinidae )〕
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