Serpianosaurus Mirigiolensis on:
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''Serpianosaurus'' is an 
Fossils of the type species, ''Serpianosaurus mirigiolensis, S. mirigolensis'', have been found from the middle Grenzbitumenzone, the oldest strata of Monte San Giorgio,
/ref> The locality dates back to sometime around the Anisian/ Ladinian boundary of the Middle Triassic, around 242 anum, Ma, with ''Serpianosaurus'' most likely occurring strictly during the latest Anisian. This makes it the one of the oldest sauropterygia, sauropterygians from Monte San Giorgio, with only the rare pachypleurosaur ''Odoiporosaurus'' being older. Certain aspects of its morphology also suggest it is one of the most basal forms. Cajus G. Diedrich in 2013 in paleontology, 2013 described and named a second species, ''S. germanicus'', based on a postcranial skeleton and various additional isolated remains from the Karlstadt Formation of Germany. This species represents the oldest well known record of this genus, as it comes from the upper Pelsonian, dating to the late Anisian stage of the Middle Triassic. The genus can be distinguished from other closely related pachypleurosaurs on the basis of its proportionally large skull and straight jaw. Like many other pachypleurosaurs, sexual dimorphism can be seen in ''Serpianosaurus''. Males and females are thought to differ in humerus, humeral size and shape. Any pachyostosis of the ribs is absent in ''Serpianosaurus'' specimens.Rieppel, O. (1989). A New Pachypleurosaur (Reptilia: Sauropterygia) from the Middle Triassic of Monte San Giorgio, Switzerland. ''Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences'' 323(1212):1-73. It is closely related to the genus ''Neusticosaurus''.Palaeos
/ref>
extinct
Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...
genus of pachypleurosaurs known from the Middle Triassic (late Anisian and early Ladinian stages) deposits of Switzerland
). Swiss law does not designate a ''capital'' as such, but the federal parliament and government are installed in Bern, while other federal institutions, such as the federal courts, are in other cities (Bellinzona, Lausanne, Luzern, Neuchâtel ...
and Germany. It was a small reptile, with the type specimen of ''S. mirigiolensis'' measuring long.
Fossils of the type species, ''Serpianosaurus mirigiolensis, S. mirigolensis'', have been found from the middle Grenzbitumenzone, the oldest strata of Monte San Giorgio, Switzerland
). Swiss law does not designate a ''capital'' as such, but the federal parliament and government are installed in Bern, while other federal institutions, such as the federal courts, are in other cities (Bellinzona, Lausanne, Luzern, Neuchâtel ...
, an area well known for its abundant pachypleurosaur remains. ''Serpianosaurus'' in the Paleobiology Database/ref> The locality dates back to sometime around the Anisian/ Ladinian boundary of the Middle Triassic, around 242 anum, Ma, with ''Serpianosaurus'' most likely occurring strictly during the latest Anisian. This makes it the one of the oldest sauropterygia, sauropterygians from Monte San Giorgio, with only the rare pachypleurosaur ''Odoiporosaurus'' being older. Certain aspects of its morphology also suggest it is one of the most basal forms. Cajus G. Diedrich in 2013 in paleontology, 2013 described and named a second species, ''S. germanicus'', based on a postcranial skeleton and various additional isolated remains from the Karlstadt Formation of Germany. This species represents the oldest well known record of this genus, as it comes from the upper Pelsonian, dating to the late Anisian stage of the Middle Triassic. The genus can be distinguished from other closely related pachypleurosaurs on the basis of its proportionally large skull and straight jaw. Like many other pachypleurosaurs, sexual dimorphism can be seen in ''Serpianosaurus''. Males and females are thought to differ in humerus, humeral size and shape. Any pachyostosis of the ribs is absent in ''Serpianosaurus'' specimens.Rieppel, O. (1989). A New Pachypleurosaur (Reptilia: Sauropterygia) from the Middle Triassic of Monte San Giorgio, Switzerland. ''Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences'' 323(1212):1-73. It is closely related to the genus ''Neusticosaurus''.
/ref>
References
Pachypleurosaurs Anisian life Triassic sauropterygians Middle Triassic reptiles of Europe Triassic Germany Triassic Switzerland Fossils of Germany Fossils of Switzerland Fossil taxa described in 1989 Fossil taxa described in 2013 Sauropterygian genera {{triassic-reptile-stub