Calliostomatidae: Gastropoda- Gastropods known as Snails(Mollusks)with One Shell or referred to as Univalves. Examples of Calliostomatidae:"Top Shells"
Calliostomatidae

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Calliostoma laugieri f. spongiarum- Portugal-Lot # 10141
An F+/F++ very uncommon Calliostoma laugieri f. spongiarum 10.13mm.Bucquoy, Dautzenberg & Dollfus,1882.Dredged from unknown depth in 1998 off...
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