Name: Carsosaurus.
Phonetic: Car-soe-sore-us.
Named By: Kornhuber‭ ‬-‭ ‬1893.‭
Classification: Chordata,‭ ‬Reptilia,‭ ‬Squamata,‭ ‬Lacertilia,‭ ‬Aigialosauridae.
Species: C.‭ ‬marchesetti‭ (‬type‭)‬.
Diet: Carnivore.
Size: Around‭ ‬1.5‭ ‬meters long.
Known locations: Slovenia.
Time period: Cenomanian of the Cretaceous.
Fossil representation: Well preserved remains,‭ ‬including a pregnant female.

       Carsosaurus was large for and aigialosaurid,‭ ‬but the claim to fame for this reptile was the‭ ‬2001‭ ‬discovery of four juveniles inside the body of an adult.‭ ‬The high degree of preservation in the juveniles as well as‭ ‬their location strongly suggests that these juveniles were actually offspring waiting to be born,‭ ‬and not a case of cannibalism on the part of the adult.‭ ‬This has implications for other closely related reptiles,‭ ‬some of which went on to become the mosasaurs,‭ ‬large marine reptiles such as Globidens,‭ ‬Platecarpus and Tylosaurus that would become key animals in late Cretaceous oceans.‭ ‬Although reptiles are usually described as being egg laying animals,‭ ‬live birth is well documented in some living species today,‭ ‬and is very likely to have occurred in the past given the wide expanse of reptiles living in ancient times.

Further reading
- The pectoral girdle and front limb of Carsosaurus marchesetti (Aigialosauridae), with a preliminary phylogenetic analysis of varanoids and mosasauroids. - Journal of Vertebrate Paleontology - M. W. Caldwell, R. L. Carroll & H. Kaiser - 1995.


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