Ptychodus
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Ptychodus Temporal range: late Cretaceous, 112–70 Ma |
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| Ptychodus mortoni | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Chondrichthyes |
| Subclass: | Elasmobranchii |
| Superorder: | Selachimorpha |
| Order: | †Hybodontiformes |
| Superfamily: | Hybodontoidea |
| Family: | Ptychodontidae |
| Genus: |
Ptychodus Agassiz, 1837 |
| Species | |
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Ptychodus altior Agassiz 1839 |
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Ptychodus altior Agassiz 1839
Ptychodus anonymus Williston 1900
Ptychodus arcuatus Agassiz 1837
Ptychodus articulatus Agassiz 1837
Ptychodus belluccii Bonarelli 1899
Ptychodus concentricus Agassiz 1839
Ptychodus decurrens Agassiz 1839
Ptychodus elevatus Leriche 1929
Ptychodus gibberulus Agassiz 1837
Ptychodus janewayii Cope 1874
Ptychodus latissimus Agassiz 1843
Ptychodus mahakalensis Chiplonkar and Ghare 1977
Ptychodus mammillaris Agassiz 1839
Ptychodus marginalis Agassiz 1839
Ptychodus mortoni Agassiz 1843
Ptychodus multistriatus Woodward 1889
Ptychodus oweni Dixon 1850
Ptychodus paucisulcatus Dixon 1850
Ptychodus polygyrus Agassiz 1839
Ptychodus rugosus Dixon 1850
Ptychodus spectabili Agassiz 1837
Ptychodus whipplei Marcou 1858
Ptychodus is a genus of extinct hybodontiform sharks. As well as a genus of durophagous (shell-crushing) sharks from the Late Cretaceous. Fossils of Ptychodus teeth are found in plenty in many of the Late Cretaceous marine sediments. There are many species among the Ptychodusthat have been uncovered on all the continents around the globe. Such species are Ptychodus mortoni, P. decurrens, P. marginalis, P. mammillaris, P. rugosus and P. latissimus to name a few. They died out approximately 85 million years ago in the Western Interior Sea, where a majority of them were found. A recent publication found that Ptychodus are classified as neoselachian versus hybodont or batoid.
The Genus name Ptychodus comes from the Greek words ptychos (fold/layer) and odon (tooth), so "fold teeth" describing the shape of their crushing and grinding teeth that were recovered in deposits around the Niobrara Formation.
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