Alternative spelling: Galeommatacea
Parent taxon: Galeommatida according to S. Lemer et al. 2019
See also Beu et al. 1990, Bieler and Mikkelsen 2006, Bouchet et al. 2010, Carter et al. 2011, Coan et al. 2000, Nevesskaja 2009, Rosenberg 2005 and Vokes 1980
Sister taxa: none
Subtaxa: Ephippiodontidae Galeommatidae Lasaeidae
Distribution:
• Quaternary of Argentina (3 collections), Australia (1), Ecuador (3), France (2), Greece (2), Japan (2), Mexico (10), Morocco (1), the Netherlands (5), Poland (2), Türkiye (2), the United Kingdom (10), United States (45: Alaska, California, Louisiana, Maryland, Massachusetts, New Jersey, North Carolina, South Carolina)
• Pliocene of Australia (1), Belgium (6), Indonesia (1), Jamaica (1), Panama (1), the United Kingdom (4), United States (8: California, North Carolina, South Carolina, Virginia)
• Miocene of Australia (2), Belgium (11), Bulgaria (1), Denmark (1), Ecuador (1), France (2), Germany (10), Italy (2), the Netherlands (2), Panama (3), Poland (1), United States (22: Florida, Maryland, Nebraska)
• Oligocene of France (1), Germany (1), United States (2: Washington)
• Eocene of France (1), New Zealand (2), the United Kingdom (1), United States (11: Alabama, California, Mississippi, Oregon, Texas)
• Paleocene of Belgium (1)
• Cretaceous of United States (4: South Dakota, Texas)
Total: 192 collections including 264 occurrences