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Ptychodus
ver. 1.0
Back & Forth

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 ｆormation.

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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