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Ptychodus
ver. 1.1
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Order Hybodontiformes ZANGERL, 1981
Family Ptychodontidae JAEKEL, 1898
Genus Ptychodus AGASSIZ, 1838

Ptychodus anonymus WILLISTON, 1900 : Turonian, Kamp Ranch Formation Dallas County

13 mm W

Ptychodus decurrens (AGASSIZ, 1848): Del Rio Formation (Blue Cut), McLennan County

7.8 mm W

Ptychodus elevatus: Lower Santonian, Chilisay, Aktyubinsk Region, W. Kazakhstan



Ptychodus latissimus (AGASSIZ, 1835): Upper Cretaceous, Arcadia Park Fm., Kamp Ranch Mbr, 544 Josey Ln./Fyke Rd. (cooks Creek) Dallas County

25 mm W

Ptychodus mammillaris (AGASSIZ, 1835): Upper Cretaceous, Arcadia Park Fm., Kamp Ranch Mbr, 544 Josey Ln./Fyke Rd. (cooks Creek) Dallas County

24 mm W

Ptychodus mortoni AGASSIZ, 1839: Upper Cretaceous, Niobrara Chalk Formation, Gove County, Kansas

38 mm W

Ptychodus multistriatus: Turonian, Ulanak, Mangyshlak

28 mm W

Ptychodus occidentalis (LEIDY, 1868): Blue Hill Shale Mbr., Fort Hayes Ls. Hatchett Ranch, Pueblo County, Colorado

7.5 mm W

Ptychodus paucisulcatus (pictured Ekaterinburg 1999, Vol. 2, page 238): Lower Santonian, Chilisay, Aktyubinsk Region, W. Kazakhstan

18 mm W

Ptychodus polygyrus (AGASSIZ, 1835): Upper Cretaceous, Arcadia Park Fm., Kamp Ranch Mbr, 544 Josey Ln./Fyke Rd. (cooks Creek) Dallas County

26 mm W

Ptychodus whipplei (MARCOU, 1858): a; Juana Lopez Mbr., Carlisle Shale, Hatchett Ranch, Pueblo County, Colorado, b; Eagleford Group Kamp Ranch Formation Dallas County


20120302




Ptychodus mortoni AGASSIZ, 1839: Upper Cretaceous, Niobrara Chalk Formation, Gove County, Kansas



Dentition of Ptychodus sp., Redrawn from Herman, 1975 20040101


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Fumio Nakagawa

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