Name: Cteniogenys.
Phonetic: Ten-o-gen-iss.
Named By: Charles W.‭ ‬Gilmore‭ ‬-‭ ‬1928.
Synonyms: Cteniogenys reedi.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Choristodera,‭ ‬Cteniogenidae.
Species: C.‭ ‬antiquus‭ (‬type‭)‬.
Diet: Insectivore.
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.

       Cteniogenys 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.

Further reading
-‭ ‬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.


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