Ptychodontidae

Ptychodontidae is a family of extinct neoselachian[1][2] sharks which lived from the Cretaceous to the Paleogene.[3]

Ptychodontidae Temporal range: 99.6–61.7 Ma PreꞒ Ꞓ O S D C P T J K Pg N Cretaceous to Paleogene

Ptychodus janewayii teeth (bottom row) from Cope 1874
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Chondrichthyes
Clade:	Neoselachii
Family:	†Ptychodontidae
Genera
Ptychodus

References

Hoffman BL, Hageman SA, Claycomb GD (July 2016). "Scanning electron microscope examination of the dental enameloid of the Cretaceous durophagous shark Ptychodus supports neoselachian classification". Journal of Paleontology. 90 (4): 741–762. doi:10.1017/jpa.2016.64. ISSN 0022-3360. S2CID 132252846.
Jambura PL, Kriwet J (2020-04-22). "Articulated remains of the extinct shark Ptychodus (Elasmobranchii, Ptychodontidae) from the Upper Cretaceous of Spain provide insights into gigantism, growth rate and life history of ptychodontid sharks". PLOS ONE. 15 (4): e0231544. Bibcode:2020PLoSO..1531544J. doi:10.1371/journal.pone.0231544. PMC 7176087. PMID 32320430.
"Ptychodontidae". Fossilworks. The Paleobiology Database. Retrieved 23 August 2009.

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