Silvestrosaurus is an extinct aquatic genus of lariosaurinenothosauridsauropterygian known from the Middle Triassic (Anisian-Ladinian boundary) of Monte San Giorgio, southern Switzerland. It contains a single species, Silvestrosaurus buzzii, originally considered to be a species of the closely related Lariosaurus. The species was named by Tschanz in 1989, based solely on the holotype PIMUZ T/2804 comprising the skull, the lower jaw, and a dis-articulated partial postcranialskeleton. Cyamodus hildegardis tooth bearing elements were found in the stomach region of the specimen. The holotype was collected at Punkt 902 of Monte San Giorgio, from layer 97 of the Grenzbitumen zone, dating to the Anisian-Ladinian boundary of the Middle Triassic. Kuhn-Schnyner (1990) reassigned the species to its own genus, creating the combination S. buzzii. The generic name honors a church near the collection locality of the holotype, dedicated to Saint Sylvester, a Pope during the reign of Constantine the Great, and from Greeksaurus, meaning "lizard", a common suffix for genus names of extinct reptile.[1]
Rieppel (1998) reassigned S. buzzii back to its original combination Lariosaurus buzzii, together with another lariosaurine genus Ceresiosaurus. Rieppel (1998) found the two species to form a clade with Lariosaurus valceresii, while the other species of Lariosaurus (incl. the type L. balsami) formed a second clade, a sister taxon to the first.[1] In 2004, however, this synonymy was objected by Hänni who described and named a second species for Ceresiosaurus, and by several other authors since.[2]
Featuresedit
Silvestrosaurus is very similar to its close relative Lariosaurus (see above) but there are enough differences for most people to assign them to different genera. The nasal has no contact with the prefrontal, separated by processes of the frontal and maxilla, and many parts of the skull, such as the parietal and postfrontal bones, are much broader and flatter than in Lariosaurus. The clavicles do not meet in an anteromedial suture, unlike in Lariosaurus. In Silvestrosaurus the radius is slightly longer than the ulna, but in Lariosaurus they are the same length or the radius is shorter. As the back half of the skeleton is missing, we cannot compare the number of vertebrae. Nor can we compare the hindfeet to see if Silvestrosaurus had paddles like Ceresiosaurus rather than individual toes like Lariosaurus. However, the front limbs definitely had paddles. Silvestrosaurus was only around 0.6–0.7 m (2.0–2.3 ft) long as an adult, making it relatively small for a nothosaur.[1] Larger specimens would have belonged to individuals measuring 1–1.2 m (3.3–3.9 ft) long.[3]
Referencesedit
^ abcOlivier Rieppel (1998). "The status of the sauropterygian reptile genera Ceresiosaurus, Lariosaurus, and Silvestrosaurus from the Middle Triassic of Europe". Fieldiana: Geology. New Series. 38: 1–46.
^Jasmina Hugi (October 2011). "The long bone histology of Ceresiosaurus (Sauropterygia, Reptilia) in comparison to other eosauropterygians from the Middle Triassic of Monte San Giorgio (Switzerland/Italy)" (PDF). Swiss Journal of Palaeontology. 130 (2): 297–306. Bibcode:2011SwJP..130..297H. doi:10.1007/s13358-011-0023-6. S2CID 128688930.
^Diedrich, C.G. "MARINE LARIOSAURUS (SAUROPTERYGIA) RECORDS FROM THE MIDDLE TRIASSIC OF THE GERMANIC BASIN – STRATIGRAPHIC AND PALAEOBIOGEOGRAPHIC IMPORTANCE FOR TETHYAN AND GERMANIC BASIN CORRELATION". Albertiana. 42: 31–42.
silvestrosaurus, extinct, aquatic, genus, lariosaurine, nothosaurid, sauropterygian, known, from, middle, triassic, anisian, ladinian, boundary, monte, giorgio, southern, switzerland, contains, single, species, buzzii, originally, considered, species, closely,. Silvestrosaurus is an extinct aquatic genus of lariosaurine nothosaurid sauropterygian known from the Middle Triassic Anisian Ladinian boundary of Monte San Giorgio southern Switzerland It contains a single species Silvestrosaurus buzzii originally considered to be a species of the closely related Lariosaurus The species was named by Tschanz in 1989 based solely on the holotype PIMUZ T 2804 comprising the skull the lower jaw and a dis articulated partial postcranial skeleton Cyamodus hildegardis tooth bearing elements were found in the stomach region of the specimen The holotype was collected at Punkt 902 of Monte San Giorgio from layer 97 of the Grenzbitumen zone dating to the Anisian Ladinian boundary of the Middle Triassic Kuhn Schnyner 1990 reassigned the species to its own genus creating the combination S buzzii The generic name honors a church near the collection locality of the holotype dedicated to Saint Sylvester a Pope during the reign of Constantine the Great and from Greek saurus meaning lizard a common suffix for genus names of extinct reptile 1 SilvestrosaurusTemporal range Middle Triassic 242 Ma PreꞒ Ꞓ O S D C P T J K Pg N Silvestrosaurus buzzii Lariosaurus buzzii fossil Paleontology Museum of Zurich Scientific classification Domain Eukaryota Kingdom Animalia Phylum Chordata Class Reptilia Superorder Sauropterygia Order Nothosauroidea Family Nothosauridae Subfamily Lariosaurinae Genus SilvestrosaurusKuhn Schnyner 1990 Type species Silvestrosaurus buzzii originally Lariosaurus Tschanz 1989 Rieppel 1998 reassigned S buzzii back to its original combination Lariosaurus buzzii together with another lariosaurine genus Ceresiosaurus Rieppel 1998 found the two species to form a clade with Lariosaurus valceresii while the other species of Lariosaurus incl the type L balsami formed a second clade a sister taxon to the first 1 In 2004 however this synonymy was objected by Hanni who described and named a second species for Ceresiosaurus and by several other authors since 2 Features editSilvestrosaurus is very similar to its close relative Lariosaurus see above but there are enough differences for most people to assign them to different genera The nasal has no contact with the prefrontal separated by processes of the frontal and maxilla and many parts of the skull such as the parietal and postfrontal bones are much broader and flatter than in Lariosaurus The clavicles do not meet in an anteromedial suture unlike in Lariosaurus In Silvestrosaurus the radius is slightly longer than the ulna but in Lariosaurus they are the same length or the radius is shorter As the back half of the skeleton is missing we cannot compare the number of vertebrae Nor can we compare the hindfeet to see if Silvestrosaurus had paddles like Ceresiosaurus rather than individual toes like Lariosaurus However the front limbs definitely had paddles Silvestrosaurus was only around 0 6 0 7 m 2 0 2 3 ft long as an adult making it relatively small for a nothosaur 1 Larger specimens would have belonged to individuals measuring 1 1 2 m 3 3 3 9 ft long 3 References edit a b c Olivier Rieppel 1998 The status of the sauropterygian reptile genera Ceresiosaurus Lariosaurus and Silvestrosaurus from the Middle Triassic of Europe Fieldiana Geology New Series 38 1 46 Jasmina Hugi October 2011 The long bone histology of Ceresiosaurus Sauropterygia Reptilia in comparison to other eosauropterygians from the Middle Triassic of Monte San Giorgio Switzerland Italy PDF Swiss Journal of Palaeontology 130 2 297 306 Bibcode 2011SwJP 130 297H doi 10 1007 s13358 011 0023 6 S2CID 128688930 Diedrich C G MARINE LARIOSAURUS SAUROPTERYGIA RECORDS FROM THE MIDDLE TRIASSIC OF THE GERMANIC BASIN STRATIGRAPHIC AND PALAEOBIOGEOGRAPHIC IMPORTANCE FOR TETHYAN AND GERMANIC BASIN CORRELATION Albertiana 42 31 42 nbsp Paleontology portal nbsp This article about a Triassic reptile is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Silvestrosaurus amp oldid 1191489169, wikipedia, wiki, book, books, library,
