Superfamily
Trochoidea
Tegula brunnea. Photo: (c) Asa Spade, some rights reserved (CC BY-NC)
Trochoidea is a superfamily of small to very large vetigastropod sea snails with gills and an operculum. 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.
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