Reassessment of the Aetosaur<i>‘Desmatosuchus’ chamaensis</i>with a reanalysis of the phylogeny of the Aetosauria (Archosauria: Pseudosuchia)

Parker, William G.

doi:10.1017/s1477201906001994

Cited by 78 publications

(224 citation statements)

References 30 publications

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“…Dromomeron romeri Irmis et al, 2007b AGE: Mid to late Norian (Litwin et al, 1991;Lucas, 1998a;Heckert et al, 2005;Parker, 2007;Irmis et al, 2007a Dromomeron romeri differs from Dromomeron gregorii and all other basal dinosauromorphs in possessing the following autapomorphies: (1) absence of a fourth trochanter; (2) presence of a sharp ridge on the anteromedial edge of the distal end of the femur; (3) presence of a lateral tuberosity on the anterolateral edge of the distal end of the femur; and (4) a large crest on the anteromedial edge of the astragalus and associated anteromedial concavity on the distal tibia.…”

Section: Protosuchus Richardsonimentioning

confidence: 99%

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

Nesbitt

2011

Bulletin of the American Museum of Natural History

746

2,561

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Section: Protosuchus Richardsonimentioning

confidence: 99%

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

Nesbitt

2011

Bulletin of the American Museum of Natural History

746

2,561

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“…Establishing the positional homology of osteoderms is important for evaluating taxonomic status in many tetrapod groups, including crocodylians (Ross & Mayer, 1983), aetosaurians (Parker, 2007;Parker & Martz, 2010), and chronosuchians (Buchwitz et al, 2012). This is difficult in the case of less complete or disarticulated specimens, such as that described by Schwarz-Wings et al (2011) as Alligatorellus sp., comprising articulated and disarticulated elements which they considered to represent a single individual with heterogeneous osteoderm morphology.…”

Section: Osteoderm Morphology In Atoposaurid Systematicsmentioning

confidence: 99%

Revision of the Late Jurassic crocodyliform Alligatorellus, and evidence for allopatric speciation driving high diversity in western European atoposaurids

Mannion¹

2017

Preprint

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Atoposaurid crocodyliforms represent an important faunal component of Late Jurassic to Early Cretaceous Laurasian semi-aquatic to terrestrial ecosystems, with numerous spatiotemporally contemporaneous atoposaurids known from western Europe. In particular, the Late Jurassic of France and Germany records evidence for high diversity and possible sympatric atoposaurid species belonging to Alligatorellus, Alligatorium and Atoposaurus. However, atoposaurid taxonomy has received little attention, and many species are in need of revision. As such, this potentially high European diversity within a narrow spatiotemporal range might be a taxonomic artefact. Here we provide a taxonomic and anatomical revision of the Late Jurassic atoposaurid Alligatorellus. Initially described as A. beaumonti from the Kimmeridgian of Cerin, eastern France, additional material from the Tithonian of Solnhofen, south-eastern Germany, was subsequently referred to this species, with the two occurrences differentiated as A. beaumonti beaumonti and A. beaumonti bavaricus, respectively. We provide a revised diagnosis for the genus Alligatorellus, and note a number of anatomical differences between the French and German specimens, including osteoderm morphology and the configuration and pattern of sculpting of cranial elements. Consequently, we restrict the name Alligatorellus beaumonti to include only the French remains, and raise the rank of the German material to a distinct species: Alligatorellus bavaricus. A new diagnosis is provided for both species, and we suggest that a recently referred specimen from a coeval German locality cannot be conclusively referred to Alligatorellus. Although it has previously been suggested that Alligatorellus, Alligatorium and Atoposaurus might represent a single growth series of one species, we find no conclusive evidence to support this proposal, and provide a number of morphological differences to distinguish these three taxa that appear to be independent of ontogeny. Consequently, we interpret high atoposaurid diversity in the Late Jurassic island archipelago of western Europe as a genuine biological signal, with closely related species of Alligatorellus, Alligatorium and Atoposaurus in both French and German basins providing evidence for allopatric speciation, potentially driven by fluctuating highstand sea levels.

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“…Aetosaurs (also known as Stagonolepididae) are a group of quadrupedal, armoured herbivores (and possibly omnivores) known globally from the Upper Triassic. They are diagnosed by numerous synapomorphies (Parrish 1994;Heckert et al 1996;Heckert & Lucas 1999Harris et al 2003;Parker 2007). Many studies advocate a position more derived than phytosaurs, but less derived than crocodylomorphs and 'rauisuchians' (Gauthier 1986;Benton 1999;Nesbitt 2003.…”

Section: Crurotarsimentioning

confidence: 99%

“…Therefore, proposed synapomorphies of these groups were reviewed and critically assessed, and all characters showing clear variability in other archosaur taxa were included. Lists of synapomorphies considered for each ingroup include: Aetosauria (Parrish 1994;Heckert & Lucas 1999;Parker 2007), Crocodylomorpha Sues et al 2003), Ornithischia ), Ornithosuchidae ), Phytosauria , Pterosauria ) and Saurischia .…”

Section: Ingroup Selectionmentioning

confidence: 99%

The higher-level phylogeny of Archosauria (Tetrapoda: Diapsida)

Brusatte

Benton

Desojo

et al. 2010

Journal of Systematic Palaeontology

217

318

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Crown group Archosauria, which includes birds, dinosaurs, crocodylomorphs, and several extinct Mesozoic groups, is a primary division of the vertebrate tree of life. However, the higher-level phylogenetic relationships within Archosauria are poorly resolved and controversial, despite years of study. The phylogeny of crocodile-line archosaurs (Crurotarsi) is particularly contentious, and has been plagued by problematic taxon and character sampling. Recent discoveries and renewed focus on archosaur anatomy enable the compilation of a new dataset, which assimilates and standardizes character data pertinent to higher-level archosaur phylogeny, and is scored across the largest group of taxa yet analysed. This dataset includes 47 new characters (25% of total) and eight taxa that have yet to be included in an analysis, and total taxonomic sampling is more than twice that of any previous study. This analysis produces a well-resolved phylogeny, which recovers mostly traditional relationships within Avemetatarsalia, places Phytosauria as a basal crurotarsan clade, finds a close relationship between Aetosauria and Crocodylomorpha, and recovers a monophyletic Rauisuchia comprised of two major subclades. Support values are low, suggesting rampant homoplasy and missing data within Archosauria, but the phylogeny is highly congruent with stratigraphy. Comparison with alternative analyses identifies numerous scoring differences, but indicates that character sampling is the main source of incongruence. The phylogeny implies major missing lineages in the Early Triassic and may support a Carnian-Norian extinction event.

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Reassessment of the Aetosaur‘Desmatosuchus’ chamaensiswith a reanalysis of the phylogeny of the Aetosauria (Archosauria: Pseudosuchia)

Cited by 78 publications

References 30 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

Revision of the Late Jurassic crocodyliform Alligatorellus, and evidence for allopatric speciation driving high diversity in western European atoposaurids

The higher-level phylogeny of Archosauria (Tetrapoda: Diapsida)

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