Alternative spelling: Primitiopsacea
Parent taxon: Primitiopsicopina according to A. F. Abushik 2015
See also Liebau 2005 and Mohibullah et al. 2013
Sister taxa: Clavofabellinidae, Gravioidea, Hatangeoidea, Lysogorelloidea, Pteriella, Signetopsidae, Signetopsoidea, Sulcatielloidea, Venzavelloidea
Subtaxa: Graviidae Lysogorellidae Primitiopsidae Venzavellidae
Type: Primitiopsis
Ecology: epifaunal suspension feeder
Distribution:
• Couvinien of Australia (1 collection)
• Devonian of China (1), Czechia (1), France (3), Poland (22), the Russian Federation (8), Türkiye (1), United States (3: New York)
• Silurian of Canada (1: Québec), Germany (4), Lithuania (3), the Russian Federation (4), Ukraine (2)
• Whiterockian of United States (2: Nevada)
• Ordovician of United States (11: Iowa, Minnesota, Oklahoma)
Total: 67 collections including 88 occurrences