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Ptychodus
ver. 1.0
Back & Forth

Cohort Euselachii Hay, 1902
Superfamily Hybodontoidea Zangerl, 1981
Family Ptychodontidae Jaekel, 1898
Ptychodus Agassiz, 1838

Texas


25 mm W
Ptychodus latissimus

24 mm W
Ptychodus mammillaris



26 mm W
Ptychodus polygyrus
upper Cretaceous, Arcadia Park Fm., Kamp Ranch Mbr, 544 Josey Ln./Fyke Rd. (cooks Creek) Dallas County



Ptychodus whipplei
Juana Lopez Mbr., Carlisle Shale, Hatchett Ranch, Pueblo County, Colorado


7.3 mm W

P. whipplei (Symphyseal)
Eagleford Group Kamp Ranch Formation Dallas County




13 mm W

Ptychodus anonymus
Kamp Ranch Formation Dallas County



7.8 mm W

Ptychodus decurrens
Del Rio Formation (Blue Cut), McLennan County


Kansas

38 mm W

Ptychodus mortoni
Upper Cretaceous, Niobrara Chalk Formation, Gove County, Kansas


Colorado




7.5 mm W

Ptychodus occidentalis
Blue Hill Shale Mbr., Fort Hayes Ls. Hatchett Ranch, Pueblo County, Colorado


Kazakhstan


28 mm W

Ptychodus multistriatus
Toronian, Ulanak, Mangyshlak



18 mm W
Ptychodus paucisulcatus


15 mm W,, 10 mm W

Ptychodus elevatus
Lower Santonian, Chilisay, Aktjubinsk Region, W. Kazakhstan


Japan


29 mm W
Ptychodus cf. latissimus
Ezo Group, Haboro, Hokkaido, Japan


Ptychodus mortoni

Upper Cretaceous, Niobrara Chalk Formation, Gove County, Kansas


Cohort Euselachii Hay, 1902
Superfamily Hybodontoidea Zangerl, 1981
Family Ptychodontidae Jaekel, 1898
Ptychodus Agassiz, 1838

Niobrara Chalk Formation: Many associated teeth of Ptychodus mortoni have been found from this ‚†ormation.



Ptychodus mortoni Agassiz, 1843





Dentition of Ptychodus sp., redrawn from Herman 1975








Symphysial tooth battery
The two teeth are combined together by a cement-like material.



lateral tooth, L1 &
R1



Posterior teeth R4, R5, R6



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