Named By: Charles W. Gilmore - 1928.
Synonyms: Cteniogenys reedi.
Classification: Chordata, Reptilia, Choristodera, Cteniogenidae.
Species: C. antiquus (type).
Size: Individuals range between 25 and 50 centimetres long.
Known locations: Canada - Oldman Formation, England - Chipping Norton Limestone Formation, Forest Marble Formation, Portugal - Alcobaça Formation, Russia - Moskovoretskaya Formation, Scotland - Kilmaluag Formation, and the USA including South Dakota, Utah and Wyoming - all Morrison Formation.
Time period: Bathonian of the Jurassic through to the Campanian of the Cretaceous.
Fossil representation: Several individuals though often of only partial remains.
is a genus of reptile that is commonly found associated with former
deposits of freshwater. This has led to the possible scenario of
Cteniogenys being semi-aquatic and perhaps even
hunting for fish.
It may be however that the remains of these individuals may have
simply been taking a drink near the time of their death, and were
more likely to be preserved by the water and mud where they would be
covered up from scavenging predators.
There has been speculation that the Canadian fossils of Cteniogenys may in fact represent a similar but different species or genus of reptile. This is because at the time of writing the Canadian specimens of Cteniogenys are the only ones that are dated to the Late Cretaceous, with all of the other fossils of Cteniogenys from the United States to Europe being dated to the late Jurassic. This means that this is a temporal gap of at least sixty-six million years between the Canadian fossils and those of the rest of the world. Of course this does not make it impossible that the Canadian remains are those of the genus, but to further complicate matters, the Canadian specimens of Cteniogenys are only of partial skulls and jaws which means that there is even less material to compare them to.
- Fossil lizards of North America. - Memoirs of the National Academy of Sciences 22(3):1-201 - Charles W. Gilmore - 1928.
- New material of Cteniogenys (Reptilia: Diapsida) and a reassessment of the phylogenetic position of the genus - Neues Jahrbuch für Geologie und Paläntologie, Monatshefte 1989 (10): 577–589. - Susan E. Evans - 1989.