Protozoa - Nassellaria - Eucyrtiidae
Synonym: Theoperidae Haeckel 1881
Parent taxon: Eucyrtidiacea according to P. De Wever et al. 2001
See also Sharma and Takahashi 2007 and Zügel 1997
Sister taxa: Bekomidae, Eucyrtidiidae, Lophocyrtiidae, Obeliscoitidae, Pseudodictyomitridae, Theocotylidae, Xitidae
Subtaxa: Anthocyrtis Cyrtopera Dictyophimus Dictyopodium Ectonocorys Eusyringium Gondwanaria Lithochytris Lithostrobus Lychnocanium Pterosyringium Rhopalatractus Rhopalocanium Sethochytris Tetracapsa Theocorys Theopera Theophaena Theopodium Udan Valkyria
Ecology: passively mobile planktonic omnivore
Distribution:
• NN21 of North Pacific (6 collections)
• Quaternary of Japan (8), North Pacific (253), Southern Ocean (2)
• C2 of North Pacific (2)
• Pliocene to Pleistocene of North Pacific (1)
• Pliocene of North Pacific (18), Southern Ocean (10)
• Neodenticula kamtschatica of North Pacific (3)
• Miocene to Pliocene of North Pacific (1)
• Miocene of Ecuador (1), Japan (1), North Pacific (54), South Pacific (1), Southern Ocean (12)
• Oligocene of North Pacific (20), South Pacific (2)
• Eocene to Oligocene of North Pacific (4), South Pacific (2)
• Eocene of Cyprus (6), North Atlantic (17), North Pacific (141), Peru (1), South Pacific (51)
• Paleocene to Eocene of North Atlantic (2), South Pacific (1)
• Paleocene of China (1), Cyprus (1), New Zealand (29), North Atlantic (3), South Pacific (1)
• Cretaceous to Paleogene of North Atlantic (1)
• Cretaceous of Antarctica (1), Austria (2), Canada (1: Nunavut), Japan (4), New Zealand (7), Oman (5), the Russian Federation (6)
• Jurassic of Antarctica (12), Austria (4), Canada (8: British Columbia), Germany (1), Italy (2), Japan (6), the Philippines (1), the Russian Federation (8), Türkiye (1), United States (8: California)
Total: 733 collections including 1171 occurrences