†order Pelagiellida (mollusk)
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, Helcionellidae, Helcionelliformes, Michniakia, Stenothecidae
Subtaxa: Aldanellidae Pelagielloidea
Ecology: epifaunal grazer
Distribution:
• Ordovician of Mexico (2 collections)
• Cambrian of Canada (21: Newfoundland and Labrador, Nova Scotia), China (10), Estonia (1), Guinea (1), Iran (1), Mongolia (2), the Russian Federation (55), Saint Pierre and Miquelon (1), Spain (1), United States (1: Massachusetts)
• Placentian of United States (5: Massachusetts)
Total: 101 collections including 134 occurrences