See text Trochida is an order of small to very large vetigastropods.

It includes recent and extinct sea snails with gills and an operculum.

[2] Extant trochomorphs stem from a large, archaic clade.

[3] According to Uribe et al. (2016) the superfamilies Angarioidea and Phasianelloidea are deeply nested within the superfamily Trochoidea sensu Williams (2012).

[4][5] The revised taxonomy (2017) of Bouchet et al. therefore only recognizes the superfamily Trochoidea (including Angarioidea and Phasianelloidea).