Alternative spelling: Megalodontacea
Parent taxon: Megalodontida according to J. G. Carter et al. 2011
See also Nevesskaja 2009, Newell 1965, Vokes 1980 and Yancey and Stanley 1999
Sister taxon: Mecynodontoidea
Subtaxa: Ceratomyopsidae Dicerocardiidae Gemmelarodus Megalodontidae Pachyrismatidae Wallowaconchidae
Ecology: stationary semi-infaunal suspension feeder
Distribution:
• Cretaceous of Austria (2 collections), Egypt (8), Germany (1)
• Jurassic of Algeria (1), China (1), Ethiopia (3), France (5), Germany (4), India (20), Indonesia (2), Iran (2), Italy (3), Jordan (9), Kenya (5), Madagascar (5), Morocco (1), Oman (1), Portugal (2), Saudi Arabia (46), Slovenia (3), Somalia (10), Spain (1), Switzerland (1), Tajikistan (1), Tanzania (1), Tunisia (26), the United Kingdom (4), Yemen (14)
• Triassic of Austria (21), Bulgaria (1), Canada (5: British Columbia, Yukon), China (4), Colombia (2), East Timor (1), Germany (4), Greece (1), Hungary (34), India (2), Indonesia (5), Italy (40), Japan (1), Peru (2), Poland (3), Romania (1), Serbia and Montenegro (2), Slovenia (1), Svalbard and Jan Mayen (1), Switzerland (2), Tajikistan (1), Turkey (3), the United Arab Emirates (5), United States (7: Alaska, Nevada, Oregon)
• Permian of China (1), India (1), Malaysia (1)
• Devonian of Australia (1), Austria (1), Canada (2: Alberta), China (1), Germany (7), Italy (1)
• Niagaran of United States (1: Indiana)
• Silurian of the Russian Federation (4), Sweden (3), United States (3: Alaska, Iowa)
Total: 358 collections including 608 occurrences