Gastropoda - Patellida - Acmaeidae
Parent taxon: Acmaeidae according to P. Bouchet et al. 2005
See also Pacaud and Le Renard 1995 and Sohl 1964
Sister taxa: Asteracmea, Bathyacmaea, Chiazacmea, Conorhytis, Deslongchampsia, Hamptoniella, Naccula, Patelloidinae, Pseudorhytidopilus, Rhodopetalinae, Scurriopsis, Serradonta, Tectura
Subtaxa: Acmaea
Ecology: facultatively mobile epifaunal grazer
Distribution:
• Quaternary of Australia (1 collection), the Bahamas (1), Bermuda (1), Ecuador (1), Italy (1), Japan (1), Mexico (14), the Seychelles (1), the United Kingdom (1), United States (43: Alaska, California)
• Pliocene of Jamaica (4), Japan (2), Panama (1), Spain (6), Trinidad and Tobago (2), United States (4: California, Virginia)
• Miocene to Pliocene of United States (1: California)
• Miocene of Austria (2), Greenland (1), Japan (2), Poland (1), United States (3: California), Venezuela (1)
• Oligocene of Canada (2: British Columbia), Germany (1), Romania (1), United States (3: California, Oregon, Washington)
• Eocene of Brazil (1), Germany (1), the Russian Federation (2), United States (13: California, Oregon, Texas, Washington)
• Paleocene of Antarctica (1), Belgium (1), Denmark (1), Greenland (1), Poland (4), United States (1: California)
• Cretaceous of Antarctica (1), Germany (1), Japan (5), Poland (2), the United Kingdom (3), United States (24: Alabama, Arizona, Colorado, Mississippi, Tennessee, Texas)
• Jurassic of the United Kingdom (1)
• Triassic of Peru (1)
Total: 166 collections including 189 occurrences