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:
• Quaternary of Japan (8 collections)
• Miocene of Ecuador (1), Japan (1)
• Eocene of Cyprus (6), Peru (1)
• Paleocene of China (1), Cyprus (1), New Zealand (29)
• 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), Turkey (1), United States (8: California)
Total: 125 collections including 186 occurrences