Heterodontiformes

Heterodontiformes; Temporal range:
	Heterodontus japonicus
	Paracestracion danieli
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Chondrichthyes
Subclass:	Elasmobranchii
Subdivision:	Selachimorpha
Superorder:	Galeomorphii
Order:	Heterodontiformes; L. S. Berg, 1940
Genera
	†Proheterodontus; †Palaeoheterodontus; †Procestracion; †Paracestracionidae †Paracestracion; ; Heterodontidae Heterodontus; ;

Heterodontiformes is an order of sharks in the superorder Galeomorphii. It includes the bullhead sharks (genus Heterodontus), and several extinct genera. The earliest known members of the group are from the Early Jurassic (Toarcian), around 175 million years ago. Several extinct genera are known from the Jurassic, with all except Paracestracion only known from isolated teeth. The oldest known members of the modern genus appeared during the Late Jurassic.^[1]

References

↑ Slater, Tiffany S.; Ashbrook, Kate; Kriwet, Jürgen (August 2020). Cavin, Lionel (ed.). "Evolutionary relationships among bullhead sharks (Chondrichthyes, Heterodontiformes)". Papers in Palaeontology. 6 (3): 425–437. doi:10.1002/spp2.1299. hdl:10468/10339. ISSN 2056-2799.

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[1] Slater, Tiffany S.; Ashbrook, Kate; Kriwet, Jürgen (August 2020). Cavin, Lionel (ed.). "Evolutionary relationships among bullhead sharks (Chondrichthyes, Heterodontiformes)". Papers in Palaeontology. 6 (3): 425–437. doi:10.1002/spp2.1299. hdl:10468/10339. ISSN 2056-2799.

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