Full reference: S. A. Miller. 1889. North American geology and palaeontology for the use of amateurs, students and scientists 1-664
Parent taxon: Conocardioida according to J. Pojeta and B. Runnegar 1976
Sister taxa: Conocardiacea, Conocardioidea, Hippocardioidea
Subtaxa: Eopteriidae
Type: Eopteria
Ecology: stationary semi-infaunal suspension feeder
Distribution:
• Whiterockian of United States (2: Nevada collections)
• Ordovician of Argentina (2), Australia (17), Canada (16: Newfoundland, Newfoundland and Labrador, Quebec), France (1), Kazakhstan (1), Malaysia (4), North Korea (1), Norway (1), South Korea (1), the United Kingdom (3), United States (33: Alabama, Alaska, Arkansas, Kentucky, Missouri, Nevada, Texas, Vermont, Virginia)
• Cambrian of Australia (15)
Total: 97 collections including 117 occurrences