†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: Caseodontoidea, Edestoidea, Edistidae, Pseudodontichthys

Subtaxa: Agassizodus Arpagodus Campyloprion Helicoprion Hunanohelicoprion Parahelicoprion Sarcoprion Sinohelicoprion Toxoprion

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Type: Helicoprion

Ecology: nektonic carnivore

Distribution:

• Permian of Australia (1 collection), Canada (4: Alberta, British Columbia, Nunavut), China (7), Japan (2), Kazakhstan (1), Mexico (1), the Russian Federation (1), United States (21: California, Idaho, Montana, Nevada, Texas, Utah, Wyoming)

• Pennsylvanian of United States (1: Unknown)

• Carboniferous of the Russian Federation (1), United States (3: New Mexico, Texas)

Total: 43 collections including 47 occurrences

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