Trochida
Trochida is an order of small to very large vetigastropod, Recent and extinct sea snails with gills and an operculum.Taxonomy
Still existing trochomorphs stem from a large, archaic clade. According to Uribe et al. the superfamilies Angarioidea and Phasianelloidea are deeply nested within the superfamily Trochoidea sensu Williams. The revised taxonomy of Bouchet et al. therefore only recognizes the superfamily Trochoidea.Superfamilies
;Synonyms:
- Angarioidea Gray, 1857: synonym of Trochoidea Rafinesque, 1815
- Phasianelloidea Swainson, 1840: synonym of Trochoidea Rafinesque, 1815
