Parent taxon: Heterobranchia according to A. Nützel and C. Ketwetsuriya 2016
See also Bandel 2002 and Heidelberger 2001
Sister taxa: Allogastropoda, Anomalorbis, Palaeoalvania, Stuoraxidae, Valvatoidea, Architectibranchia, Acteonoidea, Euthyneura, Nerineoidea, Misurinella, Architectonicoidea
Subtaxa: Cassianebalidae Donaldinidae Heterosubulitidae Rigauxia Streptacididae
Type: Streptacis
Ecology: epifaunal
Distribution:
• Cretaceous of France (1 collection), United States (1: Mississippi)
• Jurassic of Hungary (1), Israel (1), Tunisia (1)
• Triassic of China (6), Italy (3)
• Leonard of United States (1: Utah)
• Permian of China (9), Greece (6), Japan (1), Malaysia (1), the Russian Federation (16), Thailand (3), United States (22: Alaska, Nevada, New Mexico, Texas, Wyoming), Venezuela (1)
• Virgilian of United States (9: Maryland, Nebraska, New Mexico, Ohio, Oklahoma, West Virginia)
• Desmoinesian of United States (19: Illinois, Kansas, Missouri, New Mexico, Ohio, Oklahoma, Texas)
• Atokan of United States (3: Ohio, Wyoming)
• Chesterian of United States (6: Illinois, Kentucky, Ohio)
• Carboniferous of Australia (6), Germany (1), Japan (1), Mexico (1), the United Kingdom (42), United States (22: Arizona, Iowa, Kansas, Maryland, Missouri, Nevada, New mexico, Ohio, Oklahoma, Texas, Virginia, Wyoming)
• Devonian of Germany (2), the United Kingdom (1), United States (3: Arizona)
• Ordovician of the United Kingdom (1)
Total: 191 collections including 266 occurrences