†family Helicoprionidae Karpinsky 1911 (chimaera)

Chondrichthyes - Eugeneodontiformes - Helicoprionidae

Synonym: Agassizodontidae Zangerl 1981

Parent taxon: Eugeneodontiformes according to W. M. Itano and S. G. Lucas 2018

See also Ginter et al. 2010, Goto and Okura 2004, Nelson 2006 and Obruchev 1964

Sister taxa: Campyloprion, Campyloprion annectans, Caseodontoidea, Edestoidea, Edistidae, Helicampodontidae, Pseudodontichthys

Subtaxa: Agassizodus Arpagodus Helicoprion Karpinskiprion Parahelicoprion Sarcoprion Toxoprion

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Type: Helicoprion

Ecology: nektonic carnivore

Distribution:

• Permian of Australia (1 collection), Bolivia (1), Canada (4: Alberta, British Columbia, Nunavut), China (1), Greenland (2), Japan (2), Kazakhstan (1), Mexico (1), the Russian Federation (1), United States (24: California, Idaho, Kansas, Montana, Nevada, New Mexico, Texas, Utah, Wyoming)

• Pennsylvanian of United States (1: Iowa)

• Carboniferous of Japan (1), the Russian Federation (2), United States (4: Nebraska, New Mexico)

Total: 46 collections including 50 occurrences

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