Rhynchonellata - Spiriferida - Cyrtinopsidae
Parent taxon: Delthyridoidea according to A. Williams et al. 2006
Sister taxa: Acrospiriferidae, Delthyrididae, Filispiriferidae, Hysterolitidae, Mucrospiriferidae
Subtaxa: Araspiriferinae Cyrtinopsinae
Type: Cyrtinopsis
Ecology: stationary epifaunal suspension feeder
Distribution:
• Devonian of Australia (9 collections), Austria (1), Canada (12: Ontario, Quebec, Yukon), China (1), the Czech Republic (3), Germany (1), Mongolia (2), New Zealand (1), the Russian Federation (5), United States (92: California, Indiana, Nevada, New York, Oklahoma, Pennsylvania, West Virginia, West Virginia, Maryland, Pennsylvania), Venezuela (1)
• Silurian to Devonian of United States (1: Oklahoma)
• Silurian of Australia (1), Canada (1: Northwest Territories), the Czech Republic (5), Sweden (11), the United Kingdom (6), United States (10: Arkansas, New York, Oklahoma)
Total: 163 collections including 166 occurrences