Full reference: B. G. Baarli, B. Huang, and L. S. Maroja. 2022. Phylogeny of the Ordovician and Silurian members of the order Atrypida. Journal of Systematic Palaeontology 20(1):2145920
Parent taxon: Atrypida according to B. G. Baarli et al. 2022
Sister taxa: Anazygidina, Antelocoelia, Atrypidina, Davidsoniidina, Lissatrypidina, Undithyrella, Wutubulakia
Subtaxa: Dihelictera Eiratrypa Nottina Procarinatina Protatrypa Zygospiraella
Type: Protatrypa
Ecology: stationary epifaunal suspension feeder
Distribution:
• Silurian of Canada (20: New Brunswick, Ontario, Quebec, Québec collections), China (23), Estonia (22), Kazakhstan (5), Norway (35), the Russian Federation (21), Sweden (1), Ukraine (1), the United Kingdom (7), United States (3: California, Indiana, Iowa)
• Ordovician to Silurian of Norway (1), United States (1: Illinois)
• Ordovician of Canada (1: Québec), Norway (2), Türkiye (1)
Total: 144 collections including 154 occurrences