Ptychodus
ver. 1.1
| 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 |
