Parent taxon: Praecardioidei according to J. G. Carter et al. 2011
See also Bouchet et al. 2010 and Kříž 2007
Sister taxa: Praecardioidea, Praecardiida
Subtaxa: Cardiolidae Slavidae
Type: Cardiola
Ecology: facultatively mobile epifaunal suspension feeder
Distribution:
• Eocene of Romania (1 collection)
• Carboniferous of Morocco (2), United States (3: Iowa, Missouri)
• Devonian of Germany (4), United States (10: New York)
• Silurian to Devonian of Algeria (1), Italy (1), Mauritania (1)
• Silurian of Algeria (4), Austria (8), Canada (1: Northwest Territories), China (1), the Czech Republic (52), Estonia (1), France (4), Germany (2), Italy (13), Lithuania (6), Morocco (20), Poland (8), Spain (2), the United Kingdom (17), United States (1: Maine), Western Sahara (1)
Total: 164 collections including 310 occurrences