Gastropoda - Trochoidea - Trochidae
Parent taxon: Trochidae according to P. Bouchet et al. 2005
See also Beesley 1998 and Knight et al. 1960
Sister taxa: Anticonulus, Antisolarium, Buckmanina, Calliostomatinae, Canthardinae, Chlorostoma, Chuelskia, Cirsostylus, Cittarium, Cochleochilus, Coeloconulus, Coralastele, Enida, Eocalliostoma, Eucyclinae, Falsotectus, Francisciconcha, Gallensteinia, Gena, Granulifera, Hybochelus, Karabolkia, Lirulariinae, Lithotrochus, Livona, Margarella, Microgaza, Monodontinae, Phorcus, Prothalotia, Serratotrochus, Solariconulus, Stelzneria, Stomatellinae, Suavotrochus, Synaptocochlea, Thalotia, Trochaclididae, Trochaclis, Trochinae, Trochotectus, Trochus, Turcicula, Umboniinae, Vacekia, Eostomias, Stomatiinae
Subtaxa: Botelloides Charisma Halistylus
Type: Halistylus
Ecology: epifaunal grazer
Distribution:
• Quaternary of Brazil (6 collections), Mexico (2), United States (26: California)
• Miocene of United States (2: California)
• Paleocene of Australia (1)
Total: 37 collections each including a single occurrence