†order Helodontiformes (chimaera)

Chondrichthyes - Helodontiformes

Parent taxon: Holocephali according to J. A. Long 2011

See also Nelson 2006

Sister taxa: Debeeriformes, Delphyodontos, Edaphodontidae, Eugeneodontiformes, Holocephalomorpha, Iniopterygiformes, Macrodontacanthus, Menaspacanthus, Orodontiformes, Paraselachiamorpha, Paraselachimorpha, Petalodontiformes, Physonemus, Ptyktoptychion, Thoralodus, Pseudodontichthyidae, Metaxyacanthus, Ageleodus, Mesolophodus, Desmiodus, Cynopodius, Gregoriidae, Lagarodontidae, Brachyrhizodus, Euglossodus

Subtaxa: Helodontidae

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Ecology: nektobenthic carnivore

Distribution:

• Permian of Australia (1 collection), Greenland (1), United States (5: Wyoming)

• Pennsylvanian of the United Kingdom (1)

• Chesterian of Canada (1: Alberta)

• Carboniferous of the United Kingdom (3), United States (2: Arizona, Nebraska)

• Mississippian of the United Kingdom (1), United States (1: Indiana)

Total: 16 collections including 22 occurrences

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