Changes: Spondylosoma

Latest revision as of 22:26, 27 March 2024

Spondylosoma (meaning "vertebra body") is a genus of aphanosaur from the late Ladinian-age Middle Triassic Lower Santa Maria Formation in Geopark of Paleorrota, Brazil. Studies have gone back & forth on its identity, suggesting rauisuchian or basal saurischian dinosaur, with current consensus being that it was an aphanosaurian avemetatarsalian. The genus contains the type & only species S. absconditum.

History

Friedrich von Huene based the genus on a fragmentary post-cranial skeleton held at the University of Tübingen. This skeleton includes two teeth, two cervical vertebrae, four dorsal vertebrae, three sacral vertebrae, scapulae, part of a humerus, part of a femur, & part of a pubis. At the time, he thought it was a prosauropod.[1] With the discovery of basal dinosaur Staurikosaurus, Spondylosoma drew attention as a possible relative. Authors have gone back & forth on the question, considering it either as a basal dinosaur, or as a "thecodont" or other basal archosaur. The two most recent papers to address it illustrate this clearly: in 2000, Peter Galton claimed that it lacks dinosaurian characteristics & was probably a rauisuchian,[2] whereas in 2004 Max Langer disputed this & included Spondylosoma as a possible basal dinosaur similar to the herrerasaurs (but did not firmly rule out rauisuchian affinities).[3] It is now believed that their closest relatives are Dongusuchus, Teleocrater, & Yarasuchus, being firmly within Aphanosauria, with the sister clade being Ornithodira.

@@ Line 1: / Line 1: @@
+{{Animal_Taxobox|domain=[[Eukarya]]|kingdom=[[Animalia]]|phylum=[[Chordata]]|subphylum=[[Vertebrata]]|superclass=[[Tetrapoda]]|class=[[Sauropsida]]|genus=Spondylosoma|species=S. Absconditum}}
-'''''[[File:Spondylosoma.jpg|right]]Spondylosoma''''' (meaning "vertebra body") is a genus of archosaur of uncertain affinities from the late Ladinian-age Middle Triassic Lower Santa Maria Formation in Geopark of Paleorrota, Brazil. Recent studies have gone back and forth on its identity, suggesting rauisuchian or basal saurischian dinosaur. If it was a dinosaur, it would be the oldest. Like ''[[Nyasasaurus]]'' they both lived in the Middle Triassic.
+'''''Spondylosoma''''' (meaning "vertebra body") is a genus of [[Aphanosauria|aphanosaur]] from the late [[Ladinian]]-age Middle [[Triassic]] Lower Santa Maria Formation in Geopark of Paleorrota, Brazil. Studies have gone back & forth on its identity, suggesting [[Rauisuchia|rauisuchian]] or basal saurischian dinosaur, with current consensus being that it was an aphanosaurian [[Avemetatarsalia|avemetatarsalian]]. The genus contains the type & only species ''S. absconditum.''
-== History ==
+==History==
+Friedrich von Huene based the genus on a fragmentary post-cranial skeleton held at the University of Tübingen. This skeleton includes two teeth, two cervical vertebrae, four dorsal vertebrae, three sacral vertebrae, scapulae, part of a humerus, part of a femur, & part of a pubis. At the time, he thought it was a prosauropod.[1]
+With the discovery of basal dinosaur ''[[Staurikosaurus]]'', ''Spondylosoma'' drew attention as a possible relative. Authors have gone back & forth on the question, considering it either as a basal dinosaur, or as a "thecodont" or other basal archosaur. The two most recent papers to address it illustrate this clearly: in 2000, Peter Galton claimed that it lacks dinosaurian characteristics & was probably a [[Rauisuchia|rauisuchian]],[2] whereas in 2004 Max Langer disputed this & included ''Spondylosoma'' as a possible basal dinosaur similar to the herrerasaurs (but did not firmly rule out rauisuchian affinities).[3] It is now believed that their closest relatives are ''[[Dongusuchus]]'', ''[[Teleocrater]]'', & ''[[Yarasuchus]]'', being firmly within Aphanosauria, with the sister clade being [[Ornithodira]].
+==Gallery==
+<gallery widths="185">
+Screenshot 2020-11-17 at 2.31.48 PM.png
+Screenshot 2021-02-10 at 9.19.50 AM.png
+A to Z of dinosaurs 6.png
+</gallery>
-Friedrich von Huene based the genus on a fragmentary postcranial skeleton held at the University of Tübingen. This skeleton includes two teeth, two cervical vertebrae, four dorsal vertebrae, three sacral vertebrae, scapulae, part of a humerus, part of a femur, and part of a pubis. At the time, he thought it was a prosauropod.[1]
-With the discovery of basal dinosaur Staurikosaurus, Spondylosoma drew attention as a possible relative. Authors have gone back and forth on the question, considering it either as a basal dinosaur, or as a "thecodont" or other basal archosaur. The two most recent papers to address it illustrate this clearly: in 2000, Peter Galton claimed that it lacks dinosaurian characteristics and was probably a rauisuchian,[2] whereas in 2004 Max Langer disputed this and included Spondylosoma as a possible basal dinosaur similar to the herrerasaurs (but did not firmly rule out raisuchian affinities).[3] This debate will probably continue until better remains are found and described.
-[[Category:Dinosaurs]]
-[[Category:Thecodonts]]
 [[Category:Early and Middle Triassic Archosaurs]]
-[[Category:Archosaurs]]
-[[Category:Diapsid Reptiles]]
+[[Category:Diapsida]]
-[[Category:Reptiles]]
 [[Category:Triassic reptiles]]
+[[Category:1942]]
+[[Category:Triassic Fauna]]
+[[Category:Extinct fauna of Brazil]]
+[[Category:Extinct fauna of Brazil]]
+[[Category:Incomplete fossils]]
+[[Category:Mesozoic Fauna]]
+[[Category:Aphanosauria]]
+[[Category:Avemetatarsalia]]
+[[Category:Ladinian Fauna]]
+[[Category:Ladinian Reptiles]]
+[[Category:Ladinian Aphanosaurs]]