Used by Conway-Morris (1977) as an informal grade of early priapulids, but the name has been used by others, making it a proper name.
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Full reference: S. Conway Morris. 1977. Fossil priapulid worms. Special Papers in Palaeontology 20
Parent taxon: Priapulida according to J. S. Peel 2017
See also Conway Morris 1977 and Wills et al. 2012
Sister taxa: Acosmia, Archotuba, Corynetis, Eximipriapulus, Halicryptidae, Maccabeidae, Omnidens, Palaeoscolecidomorpha, Priapulidae, Priapulomorpha, Selkirkiimorpha, Sicyophorus, Tubiluchidae, Xiaoheiqingidae
Subtaxa: Ancalagonidae Fieldiidae Lecythioscopa Miskoidae Ottoidae Scolecofurca Singuuriqia
Ecology: facultatively mobile shallow infaunal carnivore
Distribution:
• Ordovician of China (1 collection), the United Kingdom (1)
• Solvan of United States (1: Nevada)
• Delamaran of Canada (23: British Columbia)
• Cambrian of Canada (4: British Columbia), China (4), Greenland (1), United States (7: Nevada, Pennsylvania, Utah)
Total: 42 collections including 57 occurrences