Alternative spelling: Poromyacea
Parent taxon: Poromyida according to J. G. Carter et al. 2011
See also Bouchet et al. 2010, Coan et al. 2000, Nevesskaja 2009, Newell 1965, Squires 1984, Vokes 1980 and Ward and Blackwelder 1987
Sister taxa: Cuspidarioidea, Parilimyoidea, Verticordioidea
Subtaxa: Cetoconchidae Poromyidae
Ecology: facultatively mobile infaunal suspension feeder
Distribution:
• Quaternary of United States (5: California, Florida collections)
• Pliocene of Belgium (1), Holy See (Vatican City State) (1), Italy (1), Jamaica (3), Panama (1), the United Kingdom (3)
• Miocene of Cyprus (1), Germany (4), Japan (1), United States (1: Maryland)
• Oligocene of Denmark (3)
• Eocene of Belgium (2), New Zealand (1), Pakistan (11), the United Kingdom (1), United States (6: Louisiana, Mississippi)
• Paleocene of United States (2: Texas)
• Cretaceous of Austria (3), Brazil (16), Bulgaria (1), Cameroon (5), Canada (19: Alberta, British Columbia), China (1), Colombia (1), the Congo-Brazzaville (1), the Congo-Kinshasa (1), Denmark (1), Egypt (6), Gabon (5), Germany (1), India (1), the Netherlands (1), Nigeria (5), Peru (12), Poland (8), the Russian Federation (1), Spain (1), USSR (3), the United Kingdom (2), United States (211: Alabama, Arizona, Arkansas, California, Delaware, Georgia, Maryland, Mississippi, Missouri, Montana, New Jersey, New Mexico, North Carolina, South Carolina, Tennessee, Texas, Utah), Venezuela (1)
Total: 355 collections including 397 occurrences