Physonemus Agassiz 1843 (chimaera)

Chondrichthyes

Alternative spelling: Onchus (Physonemus)

Full reference: L. Agassiz. 1843. Recherches Sur Les Poissons Fossiles. Tome I (livr. 18). Imprimerie de Petitpierre, Neuchatel xxxii-188

Parent taxon: Holocephali according to W. W. Nassichuk 1971

See also Eastman 1903, Hay 1902, Jordan 1963 and Lund 1985

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

Subtaxa: Physonemus arcuatus Physonemus asper Physonemus carinatus Physonemus gemmatus Physonemus gigas Physonemus hamuspiscatorius Physonemus mirabilis Physonemus pandatus Physonemus stellatus Physonemus striatus Physonemus subteres

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Type: Physonemus arcuatus

Ecology: nektobenthic carnivore

Distribution:

• Permian of Canada (1: Nunavut collection), United States (1: Kansas)

• Carboniferous of United States (8: Arizona, Colorado, Iowa, Kansas, Ohio, West Virginia)

• Mississippian of the United Kingdom (2)

Total: 12 collections including 14 occurrences

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