Taxa Count: 8

PTYCHODONTIDAE

Ptychodus Agassiz, 1837

Ptychodus anonymus Williston, 1900

Ptychodus decurrens Agassiz, 1838

Ptychodus mortoni (Mantell, 1836)

Ptychodus occidentalis Leidy, 1868

Ptychodus polygyrus Agassiz, 1835

Ptychodus rhombodus Underwood & Cumbaa, 2010

Ptychodus whipplei Marcou, 1858