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The osteology and systematic position of Dongusuchus efremovi Sennikov, 1988 from the Anisian (Middle Triassic) of Russia
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
Russian Acad Sci, Borissiak Paleontol Inst, Profsoyuznaya 123, Moscow 117997, Russia.;Kazan Fed Univ, Kremlyovskaya 18, Kazan 420008, Russia..
Univ Edinburgh, Sch GeoSci, Grant Inst, Kings Bld, Edinburgh EH9 3JW, Midlothian, Scotland..
2016 (English)In: Historical Biology, ISSN 0891-2963, E-ISSN 1029-2381, Vol. 28, no 4, 550-570 p.Article, review/survey (Refereed) Published
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Abstract [en]

European Russia has yielded several fragmentary but potentially important archosauriform specimens from the Middle Triassic, but these have been only briefly described in the literature. One of these puzzling taxa is Dongusuchus efremovi Sennikov, 1988, described from the Donguz Svita. We present a redescription of Dongusuchus efremovi, which includes the first photographic atlas and thorough anatomical description of the holotype and referred specimens. This taxon is shown to be a gracile, probably fast-running species with elongate and slender limbs. A phylogenetic analysis recovers Dongusuchus efremovi as an early-diverging, non-archosaurian archosauriform. Previous work had suggested that this taxon was a rauisuchid'. The gracile proportions of the femur and somewhat wedge-shaped head, however, are unusual for basal archosauriforms and are similar to the plesiomorphic state in crocodile and avian-line crown archosaurs. Several Early-Middle Triassic basal archosauriforms and early members of the crocodile and avian lineages were gracile with elongate, slender limbs. This suggests that the limb morphology of Dongusuchus efremovi may be plesiomorphic for Archosauria and proximal clades.

Place, publisher, year, edition, pages
2016. Vol. 28, no 4, 550-570 p.
Keyword [en]
Archosauromorpha, Archosauriformes, Archosauria, Middle Triassic, Donguz, Russia
National Category
Evolutionary Biology Other Earth and Related Environmental Sciences
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URN: urn:nbn:se:uu:diva-299150DOI: 10.1080/08912963.2014.992017ISI: 000373983500008OAI: oai:DiVA.org:uu-299150DiVA: diva2:949035
Available from: 2016-07-15 Created: 2016-07-15 Last updated: 2016-07-15Bibliographically approved

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Niedzwiedzki, Grzegorz

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