The
type species,
P. interruptus is known from an isolated tooth from the Late Cretaceous
Chalk Group of southern
England. Comparison between Albian-age isolated vertebrae from marine deposits in France and
Kronosaurus suggested a size of approximately for a
Polyptychodon-like brachaucheniine pliosaurid. Similar fossils of pliosaurs were found also in
Czech Republic. The species
Polyptychodon patagonicus (Ameghino, 1893), based on crocodile teeth discovered in
Argentina, shares the same genus name. According to a 2010 study,
P. patagonicus is a
nomen vanum and a
nomen dubium.
Polyptychodon hudsoni (holotytpe, SMU 60313) was described from the
Turonian-age
Eagle Ford Formation of Dallas,
Texas. It probably belongs to a different genus. ==See also==