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Superfamily Heteropoda: Pelagic species with a finlike foot and reduced shells. Atlanta, Carinaria. Superfamily Hipponicacea: Families Family Hipponicidae" Troschel,1861 Details Boss, in Parker,1982:1003; Family Fossaridae Details Boss, in Parker,1982:1004; Family Vanikoridae {Gray,1845} Details Boss, in Parker,1982:1004; Family Caledoniellidae Family Hipponicidae: Hoof Shells. Attach limpet-like to the substrate and don't move. Unlike true limpets (family Patellidae) these snails show spiral growth in their shells. Four Hawaiian species.
Superfamily Tonnacea. Heavy marine snails. The Helmet Shells: Cassis, Cassidarius. Bonnets: Phalium. Tritons: Cymatium. Tuns: Tonna. Superfamily Naticacea: Moon Shells. Burrowing species with globose shells and a drilling mechanism. Natica, Polinices. Family Cassididae: Helmuts. Typically of globular shells with short spires and apex whorls, and a vertical groove which the animals siphon protrudes. Feed almost exclusively on urchins.
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