Redescription and phylogenetic relationships of<i>Doswellia kaltenbachi</i>(Diapsida: Archosauriformes) from the Upper Triassic of Virginia

Dilkes, David W.; Sues, Hans‐Dieter

doi:10.1080/02724634.2009.10010362

Cited by 80 publications

(204 citation statements)

References 35 publications

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“…Furthermore, only precladistic diagnoses (e.g., Sues, 1976) have hypothesized the monophyly of proterochampsians including Chanaresuchus, Cerritosaurus, Gualosuchus, and Proterochampsa. Doswellia is the only taxon found closer to proterochampsians than to any other archosauriform (Benton and Clark, 1988;Dilkes and Sues, 2009).…”

Section: Monophyly Of Proterochampsiamentioning

confidence: 99%

“…The systematic position of Turfanosuchus has been debated recently and was included in only in only a few phylogenetic analysis thus far (Parrish, 1993;Dilkes and Sues, 2009). Parrish (1993) found Turfanosuchus well nested among crocodylian-line archosaurs.…”

Section: Terminologymentioning

confidence: 99%

“…A ventral carapace is also present in Protosuchus (AMNH FR 3024; BP/1/4770) and some other crocodyliforms. Vancleavea (GR 138) and Doswellia (Weems, 1980;Dilkes and Sues, 2009) are the only known non-archosaurian archosauriforms to have a ventral carapace.…”

Section: (New)mentioning

confidence: 99%

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The Early Evolution of Archosaurs: Relationships and the Origin of Major Clades

Nesbitt

2011

Bulletin of the American Museum of Natural History

742

2,561

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Section: Monophyly Of Proterochampsiamentioning

confidence: 99%

Section: Terminologymentioning

confidence: 99%

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The Early Evolution of Archosaurs: Relationships and the Origin of Major Clades

Nesbitt

2011

Bulletin of the American Museum of Natural History

742

2,561

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“…Sereno and Arcucci (1990) and Sereno (1991), in explicit phylogenetic analyses, proposed that proterochampsids were the sister group of the Archosauria. This hypothesis has been supported by later phylogenetic analyses (e.g., Parrish 1993;Juul 1994;Brusatte et al 2008;Dilkes and Sues 2009) (Fig. 1).…”

Section: Introductionmentioning

confidence: 66%

The braincase of a specimen of Proterochampsa Reig (Archosauriformes: Proterochampsidae) from the Late Triassic of Argentina

Trotteyn

Haro

2010

Paläontol. Z.

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The proterochampsids are a Triassic group of superficially crocodile-like forms belonging to the Archosauriformes. In the present contribution, we present new information regarding the braincase of the proterochampsid Proterochampsa Reig 1959, from the Ischigualasto Formation (Carnian) of Argentina, and discuss its phylogenetic considerations. Some unique neurocranial features of Proterochampsa are described, including: the prominence and thickness of the V-shaped ridge that surrounds the basisphenoidal fossa; the medially concave lateral arms of the same ridge; and the semilunar depression on the parabasisphenoid ventrolaterally exposed. Other features are only shared with likely unrelated archosauriforms, including: the great lateral development of the basipterygoid processes and caudal development of its distal end; an eight-shaped metotic foramen; laterally directed basipterygoid processes; and rostral boundary of the basisphenoidal recess V-shaped. Proterochampsa differs in many other aspects from the archosauriform Chanaresuchus, including: a proportionally shorter basioccipital basal tubera; cultriform process ovoid in cross-section; longitudinal sulcus dorsal to the basipterygoid process; deep basisphenoidal recess; and the absence of a prominent intertuberal plate. In many braincase features, Proterochampsa is more similar to archosaurs than to Euparkeria, erythrosuchids and Proterosuchus. They include a reduced semilunar depression. A ventral border of the basioccipital forming a wide convexity and a dorsoventrally thin paroccipital process likely represents a feature shared with Chanaresuchus, but not with Doswellia and other basal archosauriforms.Keywords Anatomy Á Braincase Á Archosauriformes Á Proterochampsids Á Ischigualasto formation Á Northwestern ArgentinaKurzfassung Die Proterochampsiden stellen eine triassische Gruppe dar, die oberflächlich betrachtet krokodilähnliche Formen aufweist, und den Archosauriform angehört. Im gegenwärtigen Beitrag präsentieren wir neue Information bezüglich des Hirnschädels des Proterochampsiden Proterochampsa REIG 1959, von der Ischigualasto-Formation (Carnium) Argentiniens, und besprechen einige phylogenetische Ansätze. Die wesentlichen Neurocranial-Eigenschaften von Proterochampsa werden beschrieben. Dazu gehören die Bedeutung und Dicke des V-förmigen Kamms, der die BasisphenoidGrube (basisphenoidal fossa), die mittleren konkaven seitlichen Arme desselben Kamms, und die halbmondförmige Vertiefung, die den ventrolateralen Parabasisphenoid umgibt. Andere weisen wahrscheinlich unabhängig von Archosauriformis die gleiche Funktion auf, wie die laterale Endwicklung des BasispterygoidProzesses und die Schwanzentwicklung seines Distal-Endes. Des 8-förmigen metotic Foramen, des seitlich (lateral)

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“…Referral of these elements to Euscolosuchus olseni is further supported by the distinctive external ornamentation on part of the rib shaft, which is indistinguishable from that on the external surfaces of the osteoderms and comprises round to oval pits of various sizes bounded by low ridges. The ribs clearly differ in their structure from those of Doswellia kaltenbachi, an unusual, heavily armored non-archosaurian archosauriform recovered from the Falling Creek Formation (Carnian) of Hanover County, Virginia (Dilkes and Sues, 2009). We here present a description of the two rib fragments referred to Euscolosuchus olseni and review their possible implications.…”

mentioning

confidence: 99%

Expanded dorsal ribs in the Late Triassic pseudosuchian reptile Euscolosuchus olseni

Scheyer

Sues

2016

Journal of Vertebrate Paleontology

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The presence of expanded dorsal ribs is an unusual feature found only in a small number of tetrapod taxa. This condition, characterized by broadening of much of the entire rib shaft, differs from one where only a portion of the rib shaft is expanded or bears an uncinate process (e.g., birds, crocodylians, and Sphenodon; Jenkins, 1970). Recently, there has been renewed interest in the structure and development of dorsal ribs among amniotes in connection with the evolutionary development of the carapace in turtles (Lyson et al., 2013;Schoch and Sues, 2015). Reinterpretation of the anteroposteriorly broadened dorsal ribs in the Middle Permian putative stem turtle Eunotosaurus (Lyson et al., 2013) and the discovery of similar ribs in the more derived Triassic stem turtles Odontochelys (Li et al., 2008) and Pappochelys (Schoch and Sues, 2015) suggest that this feature represented an important step in the early evolution of the turtle carapace. Sues (1992) described a series of dissociated cervical and dorsal osteoderms and an incomplete dorsal vertebra of a new archosaurian reptile, Euscolosuchus olseni, from the Vinita Formation (formerly Turkey Branch Formation; Upper Triassic: Carnian) in the Richmond Basin of the Newark Supergroup at Midlothian, Virginia. Sues et al. (1994) have discussed the fossil locality and its geological context. Based on apomorphic features of the osteoderms, which formed two rows of dermal armor over at least the neck and trunk, Sues (1992) suggested referral of Euscolosuchus olseni to Pseudosuchia (Crurotarsi). A nearly complete rib was found together with disarticulated but still associated osteoderms and a dorsal vertebra of Euscolosuchus olseni. It was not included in the original description by Sues (1992) because it was not recognized as a rib at the time. In addition, a proximal end of another rib was recovered on an earlier occasion, but it articulates almost perfectly with the left transverse process of the dorsal vertebra. Referral of these elements to Euscolosuchus olseni is further supported by the distinctive external ornamentation on part of the rib shaft, which is indistinguishable from that on the external surfaces of the osteoderms and comprises round to oval pits of various sizes bounded by low ridges. The ribs clearly differ in their structure from those of Doswellia kaltenbachi, an unusual, heavily armored non-archosaurian archosauriform recovered from the Falling Creek Formation (Carnian) of Hanover County, Virginia (Dilkes and Sues, 2009). We here present a description of the two rib fragments referred to Euscolosuchus olseni and review their possible.

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Redescription and phylogenetic relationships ofDoswellia kaltenbachi(Diapsida: Archosauriformes) from the Upper Triassic of Virginia

Cited by 80 publications

References 35 publications

The Early Evolution of Archosaurs: Relationships and the Origin of Major Clades

The Early Evolution of Archosaurs: Relationships and the Origin of Major Clades

The braincase of a specimen of Proterochampsa Reig (Archosauriformes: Proterochampsidae) from the Late Triassic of Argentina

Expanded dorsal ribs in the Late Triassic pseudosuchian reptile Euscolosuchus olseni

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