Champsosaurus livedin North America from the Late Cretaceous to the early Eocene
|Upper Triassic ( Norium ) to early Miocene|
|216.5 to approx. 20 million years|
|Cope , 1884|
The Choristodera are aquatic , crocodile-like , extinct diapside reptiles that lived in Europe, Asia, and North America from the Upper Triassic to the early Miocene .
The animals had the very elongated snout typical of fish-eaters , as it occurs today in the gharial convergent . The characteristics of their skull anatomy include the displacement of the original upper of the two diapsid temples behind the lower and the strong lateral widening of the zygomatic arches . This adaptation in the cranial structure was used to provide space for strong jaw muscles. The ribs of the choristodera were thickened from pachyostosis . Her limbs were only weakly ossified, one sternum was missing. Probably the animals swam like today's crocodiles , by winding movements of body and tail and with legs pressed against the body. The largest Choristodera were three meters long.
Some Choristodera survived the mass extinction on the Cretaceous-Tertiary border and a species of the genus Lazarussuchus recently discovered in the Czech Republic appears to have lived in the early Miocene.
The systematic position of the Choristodera is uncertain. If they were previously assigned to the Lepidosauromorpha , today it is believed that they belonged to the Archosauromorpha as a primitive group only distantly related to the Archosaurs .
- Irenosaurus Efimov, 1983
- Khurendukhosaurus Sigogneau-Russell & Efimov, 1984
- Lazarussuchus Hecht, 1992; Upper Oligocene - Early Miocene
- Cteniogelys Gilmore, 1928; Middle - Upper Jura
- Pachystropheus Huene, 1935; Upper Triassic
Monjurosuchidae Endo, 1940
- Philydrosaurus Gao & Fox, 2005; Lower Cretaceous
- Monjurosuchus Endo, 1940; Lower Cretaceous
Hyphalosauridae Gao & Fox, 2005
- Shokawa Evans & Manabe, 1999
- Hyphalosaurus Gao, Tang & Wang, 1999 Lower Cretaceous
Neochoristodera Evans & Hecht, 1993 (Champsosauriformes Hay, 1929)
Simoedosauridae Lemoine, 1884
- Tchoiria Efimov, 1975
- Ikechosaurus Sigogneau-Russell, 1981
- Simoedosaurus Gervais, 1877
Champsosauridae Cope, 1884
- Champsosaurus Cope, 1876
- Simoedosauridae Lemoine, 1884
- Robert L. Carroll : Paleontology and Evolution of the Vertebrates. Thieme, Stuttgart et al. 1993, ISBN 3-13-774401-6 .
- Martin Sander : Reptiles. 220 individual representations (= Haeckel library. Vol. 3). Enke, Stuttgart 1994, ISBN 3-432-26021-0 .
- ^ Susan E. Evans, Jozef Klembara: A choristoderan reptile (Reptilia: Diapsida) from the Lower Miocene of Northwest Bohemia (Czech Republic). In: Journal of Vertebrate Paleontology. Vol. 25, No. 1, 2005, ISSN 0272-4634 , pp. 171-184, doi : 10.1671 / 0272-4634 (2005) 025 [0171: ACRRDF] 2.0.CO; 2 .
- Mikko's Phylogeny Archive Choristodera