Parent taxon: Helcionelloida according to P. J. Wagner 2023
See also Bouchet et al. 2017, Kouchinsky et al. 2017, Sarmiento et al. 2001, Sepkoski 2002 and Thomas et al. 2020
Sister taxa: Beshtashella, Ceratoconidae, Emargimantus, Helcionellida, Helcionelliformes, Michniakia
Subtaxa: Aldanellidae Pelagielloidea
Ecology: epifaunal grazer
Distribution:
• Tremadoc of Mexico (2 collections)
• Solvan of the Czech Republic (1), Kazakhstan (1), Morocco (5), the Russian Federation (3)
• Amgan of the Russian Federation (2)
• Delamaran of Morocco (2)
• Cambrian of Antarctica (10), Australia (67), Canada (31: Newfoundland and Labrador, Nova Scotia, Quebec), China (23), the Czech Republic (2), Germany (4), Greenland (14), Guinea (1), India (1), Iran (2), Kyrgyzstan (2), Mexico (2), Mongolia (2), New Zealand (1), Poland (1), the Russian Federation (76), Saint Pierre and Miquelon (1), Spain (5), Svalbard and Jan Mayen (1), Turkey (1), the United Kingdom (4), United States (31: Georgia, Idaho, Indiana, Massachusetts, Montana, Nevada, Nevada and Utah, New York, Pennsylvania, Utah, Wisconsin)
• Placentian of United States (6: Massachusetts)
Total: 304 collections including 383 occurrences