Echinoidea - Euechinoidea - Orthopsidae
Alternative spelling: Orthopsinae
Full reference: P. M. Duncan. 1889. A revision of the genera and great groups of the Echinoidea. Journal of the Linnean Society, Zoology 23:1-311
Parent taxon: Carinacea according to A. Kroh and A. B. Smith 2010
See also Clark and Twitchell 1915, Fell and Pawson 1966, Geys and Jagt 1986, Smith 1991 and Smith 1995
Sister taxa: Calycina, Hemicidaridae, Irregularia, Pseudodiadematidae
Subtaxa: Brochechinus Dubarechinus Echinopsis Gymnodiadema Orthocidaris Orthopsis Scaptodiadema
Ecology: epifaunal grazer-deposit feeder
Distribution:
• Miocene of Madagascar (1 collection)
• Eocene of Egypt (1), Pakistan (1), Senegal (1)
• Paleocene of United States (5: Alabama, New Jersey)
• Cretaceous to Paleogene of the Netherlands (1)
• Cretaceous of Belgium (4), Brazil (5), Egypt (6), France (7), Iran (1), the Netherlands (4), Oman (3), Peru (3), Portugal (1), Saudi Arabia (4), Spain (4), Switzerland (1), the United Arab Emirates (2), United States (3: Texas)
• Jurassic of Poland (1), the United Arab Emirates (1)
Total: 60 collections including 62 occurrences