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.

Taxonomy

2005 taxonomy

This superfamily consisted of nine following families (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005):

2017 taxonomy

Williams et al. (2008) have made further refinements to the taxonomy of Trochoidea. The revised taxonomy as defined by Bouchet et al. (2017) resulted in the following families. The fossil families, tentatively included in this list, are based on Tracey et al. (1993)

Unassigned to a family:

Nomen dubium

Families brought into synonymy

  • Crosseolidae Hickman, 2013: synonym of Conradiidae Golikov & Starobogatov, 1987
  • Cyclostrematidae P. Fischer, 1865: synonym of Liotiidae Gray, 1850
  • Delphinulidae Stoliczka, 1868: synonym of Angariidae Gray, 1857
  • Gazidae Hickman & McLean, 1990: synonym of Margaritidae Thiele, 1924
  • Minoliinae Kuroda, Habe & Oyama, 1971: synonym of Solariellidae Powell, 1951
  • † Parataphrinae Calzada, 1989: synonym of † Proconulidae Cox, 1960
  • Stomatellidae Gray, 1840: synonym of Stomatellinae Gray, 1840
  • Stomatiidae Carpenter, 1861: synonym of Stomatellinae Gray, 1840
  • Tricoliidae Woodring, 1928: synonym of Tricoliinae Woodring, 1928 (rank change)
  • Hickman C. S. & McLean J. H. (1990). Systematic revision and suprageneric classification of trochacean gastropods. Science Series of Natural History Museum of Los Angeles County 35: 1-169
  • Geiger, Daniel L.; Christine E. Thacker (2005). (PDF). Molluscan Research. 25 (1): 47–55. doi:.