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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