Trochida

Trochida is an order of small to very large vetigastropods. It includes recent and extinct sea snails with gills and an operculum.

Taxonomy
Extant trochomorphs stem from a large, archaic clade. According to Uribe et al. (2016) the superfamilies Angarioidea and Phasianelloidea are deeply nested within the superfamily Trochoidea sensu Williams (2012). The revised taxonomy (2017) of Bouchet et al. therefore only recognizes the superfamily Trochoidea (including Angarioidea and Phasianelloidea).

Superfamilies

 * Trochoidea Rafinesque, 1815
 * Synonyms:
 * Angarioidea Gray, 1857 : synonym of Trochoidea Rafinesque, 1815
 * Phasianelloidea Swainson, 1840 : synonym of Trochoidea Rafinesque, 1815