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Trochoidea is a superfamily of small to very large vetigastropod sea snails with gills and an operculum. [2] Species within this superfamily have nacre as the inner shell layer. The families within this superfamily include the Trochidae, the top snails. This superfamily is the largest vetigastropodan superfamily, containing more than 2,000 species.
The Trochidae, common name top-snails or top-shells, are a family of various sized sea snails, marine gastropod molluscs in the subclass Vetigastropoda. This family is commonly known as the top-snails because in many species the shell resembles a toy spinning top .
Turbinate – Having the form of a top. [1] Turriculated – Having the form of a tower. [1] Turreted – Having the form of a tower. [1] Umbilicated – Having an opening in the base of the shell. [1] Undulated – Having undulations or waves. [1] Univalve – Having the shell composed of a single piece, as a snail. [1] Varicose – Swollen or ...
Urosalpinx cinerea, common name the eastern oyster drill, Atlantic oyster drill, or just oyster drill, is a species of small predatory sea snail, a marine gastropod mollusk in the family Muricidae, the murexes or rock snails.
Steromphala umbilicalis, common name the flat top shell, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails. [1] Description
Calliostoma is a genus of small to medium-sized sea snails with gills and an operculum, marine gastropod molluscs within the family Calliostomatidae, the Calliostoma top snails. Previously this genus was placed within the family Trochidae. Calliostoma is the type genus of the family Calliostomatidae.
Clanculus puniceus, common names the strawberry top shell or purplish clanculus, is a species of small sea snail, a marine gastropod mollusk in the family Trochidae, the top shells. [ 1 ] Shell description
Similar to other trochid snails, such as the more commonly occurring Chlorostoma species (or Tegula), the dextrally coiled shell of Norrisia norrisii is also more globose and shows a depressed-turbinate shape. [10] The spire is low-conoidal. The minute apex is subacute, and spirally striate ; when perfect, the apical whorls are variegated. The ...