Trochoidea may refer to:
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Trochoidea is a genus of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Geomitridae. The name means "those that are shaped like a top".
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.
Phasianellidae common name the "pheasant shells" or "pheasant snails" is a family of small sea snails with calcareous opercula, marine gastropod mollusks in the clade Vetigastropoda.
Velainellidae is a very small taxonomic family of fossil sea snails, marine gastropod mollusks in the superfamily Trochoidea, the top snails, turban snails and their allies.
Tychobraheidae is an extinct family of fossil sea snails, marine gastropod mollusks in the superfamily Trochoidea, the top shells and their allies, according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). This family has no subfamilies.
Eucochlidae is an extinct family of fossil sea snails, marine gastropod mollusks in the superfamily Trochoidea. This family has no subfamilies.
Vetigastropoda is a major taxonomic group of sea snails, marine gastropod mollusks that form a very ancient lineage. Taxonomically the Vetigastropoda are sometimes treated as an order, although they are treated as an unranked clade in Bouchet and Rocroi, 2005.
Margaritidae is a family of small sea snails, marine gastropod mollusks in the superfamily Trochoidea.
Minolops is a genus of sea snails, marine gastropod mollusks in the family Solariellidae within the superfamily Trochoidea, the top snails, turban snails and their allies.
Anomphalogaza is a genus of sea snails, marine gastropod mollusks in the family Margaritidae within the superfamily Trochoidea, the top snails, turban snails and their allies.
Circumstella is a genus of sea snails, marine gastropod mollusks in the family Liotiidaewithin the superfamily Trochoidea, the top snails, turban snails and their allies.
Carinator is a monotypic genus of sea snails, marine gastropod mollusks in the family Calliostomatidae within the superfamily Trochoidea, the top snails, turban snails and their allies.
Sinutor is a genus of sea snails, marine gastropod mollusks in the family Calliostomatidae within the superfamily Trochoidea, the top snails, turban snails and their allies.
Xeniostoma is a genus of sea snails, marine gastropod mollusks in the family Calliostomatidae within the superfamily Trochoidea, the top snails, turban snails and their allies.
Maurea is a genus of sea snails, marine gastropod mollusks, in the family Calliostomatidae within the superfamily Trochoidea, the top snails, turban snails and their allies.
Omphalotukaia is a genus of sea snails, marine gastropod mollusks, in the family Calliostomatidae within the superfamily Trochoidea, the top snails, turban snails and their allies.
Metaconulus is an extinct genus of sea snails, marine gastropod mollusks, in the family Calliostomatidae within the superfamily Trochoidea, the top snails, turban snails and their allies.
Calliostoma aikeni is a species of sea snail, a marine gastropod mollusk, in the family Calliostomatidae within the superfamily Trochoidea, the top snails, turban snails and their allies.
Akoya is a genus of sea snails, marine gastropod mollusks, in the family Calliostomatidae within the superfamily Trochoidea, the top snails, turban snails and their allies.
Trochida is an order of small to very large vetigastropod, Recent and extinct sea snails with gills and an operculum.