Eubrachiosaurus: Difference between revisions
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{{Automatic taxobox |
{{Automatic taxobox |
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| taxon = Eubrachiosaurus |
| taxon = Eubrachiosaurus |
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| fossil_range = [[Carnian]]<br />~{{fossil range|235.0|221.5}} |
| fossil_range = [[Carnian]]-[[Norian]]<br />~{{fossil range|235.0|221.5}} |
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| image = Eubrachiosaurus.png |
| image = Eubrachiosaurus.png |
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| image_caption = [[Stereopair]] and interpretive drawing of the left scapula from the holotype |
| image_caption = [[Stereopair]] and interpretive drawing of the left scapula from the holotype |
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| type_species = {{extinct}}'''''Eubrachiosaurus browni''''' |
| type_species = {{extinct}}'''''Eubrachiosaurus browni''''' |
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| type_species_authority = Williston 1904 |
| type_species_authority = Williston 1904 |
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| synonyms = |
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''Eubrachiosaurus'' is known only from the [[holotype]] specimen [[Field Museum of Natural History|FMNH]] UC 633, a partial left [[scapula]] as well as a left [[humerus]], and left [[pelvis]] which have been lost. It was collected at the [[Little Popo Agie River]], near Lander, [[Fremont County, Wyoming|Fremont County]] from the [[Popo Agie Formation]] of the [[Chugwater Group]]. ''Eubrachiosaurus browni'' was first described and named by [[Samuel Wendell Williston]] in [[1904 in paleontology|1904]] along with ''[[Brachybrachium]] brevipes''. Lucas and Hunt (1993) considered both taxa [[junior synonym]]s of ''[[Placerias hesternus]]'', which is known from the same formation, a position maintained in most subsequent studies. The synonymy of ''Eubrachiosaurus'' and ''Placerias'' was questioned by Long and Murry (1995) who noted that the ectepicondyle of ''Eubrachiosaurus'' was enlarged as in ''[[Ischigualastia]]''. All of Williston's dicynodont material from Popo Agie has been lost, apart from the partial left scapula of ''Eubrachiosaurus''. Kammerer ''et al.'' (2013) redescribed the available material and the missing elements were redescribed from photographs taken by Williston (1904), and suggested that ''Eubrachiosaurus'' is a valid member of the [[Stahleckeriinae]], most closely related to ''[[Sangusaurus]]''.<ref name=EubrachiosaurusRev/> |
''Eubrachiosaurus'' is known only from the [[holotype]] specimen [[Field Museum of Natural History|FMNH]] UC 633, a partial left [[scapula]] as well as a left [[humerus]], and left [[pelvis]] which have been lost. It was collected at the [[Little Popo Agie River]], near Lander, [[Fremont County, Wyoming|Fremont County]] from the [[Popo Agie Formation]] of the [[Chugwater Group]]. ''Eubrachiosaurus browni'' was first described and named by [[Samuel Wendell Williston]] in [[1904 in paleontology|1904]] along with ''[[Brachybrachium]] brevipes''. Lucas and Hunt (1993) considered both taxa [[junior synonym]]s of ''[[Placerias hesternus]]'', which is known from the same formation, a position maintained in most subsequent studies. The synonymy of ''Eubrachiosaurus'' and ''Placerias'' was questioned by Long and Murry (1995) who noted that the ectepicondyle of ''Eubrachiosaurus'' was enlarged as in ''[[Ischigualastia]]''. All of Williston's dicynodont material from Popo Agie has been lost, apart from the partial left scapula of ''Eubrachiosaurus''. Kammerer ''et al.'' (2013) redescribed the available material and the missing elements were redescribed from photographs taken by Williston (1904), and suggested that ''Eubrachiosaurus'' is a valid member of the [[Stahleckeriinae]], most closely related to ''[[Sangusaurus]]''.<ref name=EubrachiosaurusRev/> |
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Kammerer ''et al.'' (2013) also noted that Williston (1904) described ''Brachybrachium'' on the basis of a fragmentary humerus from the upper Popo Agie beds, in "almost identically the same horizon" as ''Eubrachiosaurus''. The currently lost specimen was poorly preserved with much of the proximal and distal ends missing. It shares with the humerus of ''Eubrachiosaurus'' a nearly perpendicular angle between the edges of the deltopectoral crest. Furthermore, the traits on which basis Williston used to distinguish the two taxa are either known to vary intraspecifically in [[kannemeyeriiform]]s or were too badly preserved in ''Brachybrachium'' to display clear morphological differences from ''Eubrachiosaurus''. Thus, Kammerer ''et al.'' (2013) concluded the it is probable that these two taxa are [[synonymous]], but noted that on a strict [[apomorphy]] basis ''Brachybrachium brevipes'' must be considered a ''[[nomen dubium]]''.<ref name=EubrachiosaurusRev/> |
Kammerer ''et al.'' (2013) also noted that Williston (1904) described ''Brachybrachium'' on the basis of a fragmentary humerus from the upper Popo Agie beds, in "almost identically the same horizon" as ''Eubrachiosaurus''. The currently lost specimen was poorly preserved with much of the proximal and distal ends missing. It shares with the humerus of ''Eubrachiosaurus'' a nearly perpendicular angle between the edges of the deltopectoral crest. Furthermore, the traits on which basis Williston used to distinguish the two taxa are either known to vary intraspecifically in [[kannemeyeriiform]]s or were too badly preserved in ''Brachybrachium'' to display clear morphological differences from ''Eubrachiosaurus''. Thus, Kammerer ''et al.'' (2013) concluded the it is probable that these two taxa are [[synonym (taxonomy)|synonymous]], but noted that on a strict [[apomorphy]] basis ''Brachybrachium brevipes'' must be considered a ''[[nomen dubium]]''.<ref name=EubrachiosaurusRev/> |
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== References == |
== References == |
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{{Portal bar|Paleontology}} |
{{Portal bar|Paleontology}} |
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[[Category: |
[[Category:Kannemeyeriiformes]] |
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[[Category:Carnian genera]] |
[[Category:Carnian genera]] |
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[[Category:Late Triassic |
[[Category:Late Triassic synapsids of North America]] |
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[[Category: |
[[Category:Taxa named by Samuel Wendell Williston]] |
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[[Category:Fossils of the United States]] |
[[Category:Fossils of the United States]] |
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[[Category:Paleontology in Wyoming]] |
[[Category:Paleontology in Wyoming]] |
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[[Category:Fossil taxa described in 1904]] |
[[Category:Fossil taxa described in 1904]] |
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[[Category:Anomodont genera]] |
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{{anomodont-stub}} |
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Latest revision as of 13:02, 30 June 2024
| Eubrachiosaurus | |
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| Stereopair and interpretive drawing of the left scapula from the holotype | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Synapsida |
| Clade: | Therapsida |
| Suborder: | †Anomodontia |
| Clade: | †Dicynodontia |
| Family: | †Stahleckeriidae |
| Subfamily: | †Stahleckeriinae |
| Genus: | †Eubrachiosaurus Williston 1904 |
| Type species | |
| †Eubrachiosaurus browni Williston 1904
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| Synonyms | |
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Eubrachiosaurus is an extinct genus of stahleckeriid dicynodont known from the Late Triassic (Carnian stage) of Wyoming, United States.[1]
Description
[edit]Eubrachiosaurus is known only from the holotype specimen FMNH UC 633, a partial left scapula as well as a left humerus, and left pelvis which have been lost. It was collected at the Little Popo Agie River, near Lander, Fremont County from the Popo Agie Formation of the Chugwater Group. Eubrachiosaurus browni was first described and named by Samuel Wendell Williston in 1904 along with Brachybrachium brevipes. Lucas and Hunt (1993) considered both taxa junior synonyms of Placerias hesternus, which is known from the same formation, a position maintained in most subsequent studies. The synonymy of Eubrachiosaurus and Placerias was questioned by Long and Murry (1995) who noted that the ectepicondyle of Eubrachiosaurus was enlarged as in Ischigualastia. All of Williston's dicynodont material from Popo Agie has been lost, apart from the partial left scapula of Eubrachiosaurus. Kammerer et al. (2013) redescribed the available material and the missing elements were redescribed from photographs taken by Williston (1904), and suggested that Eubrachiosaurus is a valid member of the Stahleckeriinae, most closely related to Sangusaurus.[1]
Kammerer et al. (2013) also noted that Williston (1904) described Brachybrachium on the basis of a fragmentary humerus from the upper Popo Agie beds, in "almost identically the same horizon" as Eubrachiosaurus. The currently lost specimen was poorly preserved with much of the proximal and distal ends missing. It shares with the humerus of Eubrachiosaurus a nearly perpendicular angle between the edges of the deltopectoral crest. Furthermore, the traits on which basis Williston used to distinguish the two taxa are either known to vary intraspecifically in kannemeyeriiforms or were too badly preserved in Brachybrachium to display clear morphological differences from Eubrachiosaurus. Thus, Kammerer et al. (2013) concluded the it is probable that these two taxa are synonymous, but noted that on a strict apomorphy basis Brachybrachium brevipes must be considered a nomen dubium.[1]
References
[edit]- ^ a b c Kammerer, C. F.; Fröbisch, J. R.; Angielczyk, K. D. (2013). Farke, Andrew A (ed.). "On the Validity and Phylogenetic Position of Eubrachiosaurus browni, a Kannemeyeriiform Dicynodont (Anomodontia) from Triassic North America". PLOS ONE. 8 (5): e64203. Bibcode:2013PLoSO...864203K. doi:10.1371/journal.pone.0064203. PMC 3669350. PMID 23741307.
