Osteologie Von Aëtosaurus Ferratus O. Fraas

Huene, Friedrich von

doi:10.1111/j.1463-6395.1920.tb00337.x

Cited by 26 publications

(9 citation statements)

References 2 publications

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“…Juul (1994) actually paired Stagonolepididae with Prestosuchidae. Walker (1961: 183–185), following a suggestion of Huene (1920), noted strong similarities between the aetosaurs and the erpetosuchids. He was partly misled since he included in the Family Erpetosuchidae the forms Dyoplax and Stegomus , which were later assigned to Crocodylomorpha (see below).…”

Section: Descriptionmentioning

confidence: 94%

Erpetosuchus, a crocodile-like basal archosaur from the Late Triassic of Elgin, Scotland

Benton

Walker

2002

Zoological Journal of the Linnean Society

148

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Erpetosuchus, a small archosaurian reptile from the Late Triassic of Scotland and North America, hasoften been implicated in the ancestry of crocodilians. A restudy of the type specimen, using new high‐fidelity casts, as well as examinationof new, hitherto undescribed material, allows a detailed description and restoration of Erpetosuchus granti from the LossiemouthSandstone Formation (late Carnian, Late Triassic). This small reptile is known only from the front end of its body; a complete skull,cervical vertebral column, anterior dorsals and ribs, shoulder girdle, and forelimb. The skull shows a number of unusual features: a reducedrow of only 4–5 teeth on the anterior part of the maxilla, a large antorbital fenestra set in a deep fossa whose margins aremarked by distinct sharply angled ridges, a jugal that is divided into a lateral and a ventral portion by a sharp ridge, a deeplyrecessed tympanic area, the angular and surangular marked by a strong ridge running back from the ventral margin of the mandibular fenestra,and teeth oval in cross‐section and lacking anterior and posterior carinae and marginal serrations. The remains suggest that Erpetosuchus wasa light, cursorial animal that may have fed on insects. A cladistic analysis of crurotarsan archosaurs indicates that Erpetosuchus isthe closest sister group of Crocodylomorpha among known basal archosaurs. It shares with them a deep recess in the cheek region framed bythe quadrate and quadratojugal which slope forward side‐by‐side at an angle of 45° above horizontal, and reach the uppermargin of the lower temporal fenestra. In Erpetosuchus the recess is entirely lateral, while in crocodylomorphs, the recesspenetrates medially as well, since the quadrate/quadratojugal bar meets the side wall of the braincase. © 2002The Linnean Society of London, Zoological Journal of the Linnean Society, 2002, 136, 25–47.

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Section: Descriptionmentioning

confidence: 94%

Erpetosuchus, a crocodile-like basal archosaur from the Late Triassic of Elgin, Scotland

Benton

Walker

2002

Zoological Journal of the Linnean Society

148

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“…Euparkeria capensis falls immediately outside or very close to the crown in most phylogenetic analyses (Gower and Wilkinson ; Nesbitt ) and is thus a frequent proximate outgroup in phylogenies of early archosaurs. Dorosuchus neoetus Sennikov, , from the Anisian of Russia, was referred to Euparkeriidae von Huene, when originally described based on its generally similar morphology to E. capensis , although the latter taxon remains the only species that can be confidently assigned to Euparkeriidae (Sookias and Butler ). Although the morphology of D. neoetus was described relatively extensively by Sennikov (), the intervening decades have seen substantial additional discoveries of taxonomic and anatomical diversity of Permo‐Triassic diapsids and advances in phylogenetic datasets and methodologies, and these provide an impetus for a redescription of D. neoetus .…”

Section: Institutional Abbreviationsmentioning

confidence: 99%

The monophyly of Euparkeriidae (Reptilia: Archosauriformes) and the origins of Archosauria: a revision of Dorosuchus neoetus from the Mid‐Triassic of Russia

et al. 2014

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Euparkeria capensis is resolved as the sister taxon to Archosauria in many cladistic phylogenies and provides a key outgroup which may approximate the ancestral archosaur morphology. Several other taxa have been referred to the family Euparkeriidae, but the monophyly of this taxon remains doubtful and largely untested. To test this monophyly, the archosauriform and putative euparkeriid Dorosuchus neoetus from the Mid-Triassic of Russia is re-examined in the light of recent work on the evolution of stem archosaurs. Dorosuchus neoetus is found to possess a number of morphological features that place it close to Archosauria, including a sigmoidal femur with a clear attachment region for the m. caudifemoralis musculature, but no unambiguous archosaurian apomorphies. Dorosuchus neoetus is included for the first time in a numerical cladistic analysis and is recovered as the sole sister taxon to Archosauria + Phytosauria. A monophyletic Euparkeriidae including D. neoetus and E. capensis is slightly less parsimonious. In addition, a mandible and pterygoid that were previously referred to D. neoetus subsequent to the original description of the species are also included separately within the phylogenetic analysis and are recovered within Archosauria, possibly raising questions as to their correct taxonomic referral. However, this phylogenetic placement is based primarily on the absence of palatal teeth, but the presence or absence of palatal teeth exhibits considerable homoplasy within Archosauriformes. Based on other aspects of their morphology, we do not reject the referral of these elements to D. neoetus.

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“…Parrish (1993, 1994) used the contact of the quadratojugal/postorbital as a character uniting the Aetosauria and Rauisuchidae into his monophyletic Rauisuchiformes. However, it is clear that this character does not occur in D. haplocerus nor does it occur in S. robertsoni (Walker, 1961), and possibly not in Aetosaurus ferratus (Fraas, 1877; Huene, 1920). Walker (1961) was unsure of the quadratojugal/postorbital contact in A. ferratus .…”

Section: Systematic Palaeontologymentioning

confidence: 99%

Cranial anatomy of Desmatosuchus haplocerus (Reptilia: Archosauria: Stagonolepididae)

Small

2002

Zoological Journal of the Linnean Society

165

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New skull material of the Triassic aetosaur Desmatosuchus haplocerus (Archosauria: Stagonolepididae) from the Cooper Canyon Formation (Late Triassic: early Norian) of Texas is described. This is the most complete description of the skull of Desmatosuchus to date, shedding light on the edentulous premaxilla, laterally exposed splenial on the mandible, reduced external mandibular fenestra, dentition (small denticles and wear facets), and variability of the hemispherical fontanelle. The quadratojugal/postorbital contact, a synapomorphy supposedly shared by the Stagonolepididae and Rauisuchia (sensu Parrish), is absent in Desmatosuchus. The interesting convergence in cranial and postcranial morphology of aetosaurs and certain living edentates (armadillos) suggests the possibility of insectivory or omnivory, instead of herbivory as a feeding strategy. This new description is intended to provide detailed information for future studies on the interrelationships of the Stagonolepididae (which are plagued by incomplete material), and their phylogenetic position among the archosaurs. © 2002 The Linnean Society of London, Zoological Journal of the Linnean Society, 2002, 136, 97−111.

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Osteologie Von Aëtosaurus Ferratus O. Fraas

Cited by 26 publications

References 2 publications

Erpetosuchus, a crocodile-like basal archosaur from the Late Triassic of Elgin, Scotland

Erpetosuchus, a crocodile-like basal archosaur from the Late Triassic of Elgin, Scotland

The monophyly of Euparkeriidae (Reptilia: Archosauriformes) and the origins of Archosauria: a revision of Dorosuchus neoetus from the Mid‐Triassic of Russia

Cranial anatomy of Desmatosuchus haplocerus (Reptilia: Archosauria: Stagonolepididae)

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