A new species of Theriosuchus (Atoposauridae, Crocodylomorpha) from the Late Jurassic (Kimmeridgian) of Guimarota, Portugal

Schwarz, Daniela; Salisbury, Steven W.

doi:10.1016/j.geobios.2004.04.005

Cited by 76 publications

(248 citation statements)

References 16 publications

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“…The osteoderms of A. bavaricus are imbricated along their entire length, and there is no 'peg and socket' articulation as described in two scutes assigned to Theriosuchus pusillus (Owen, 1879;Schwarz-Wings et al, 2011) and in Theriosuchus guimarotae (Schwarz & Salisbury, 2005). The osteoderms of A. bavaricus are rounded, and the lateral edges are predominantly convex, with one or two being marginally concave.…”

Section: Skullmentioning

confidence: 99%

“…These external surfaces display a moderate degree of sculpting, although to a lesser extent than that of Theriosuchus (Owen, 1879;Brinkmann, 1992;Wu, Sues & Brinkman, 1996;Schwarz & Salisbury, 2005) and Alligatorium (Wellnhofer, 1971). The skull has an acute-triangular morphology (platyrostral) in dorsal view, typical of atoposaurids, with concave lateral margins along the relatively short snout.…”

Section: Skullmentioning

confidence: 99%

“…The Late Jurassic-Early Cretaceous of Europe records high atoposaurid diversity, comprising the multispecific genera Alligatorellus, Alligatorium, Atoposaurus and Theriosuchus, as well as Montsecosuchus depereti (Gervais, 1871;Owen, 1879;Wellnhofer, 1971;Buscalioni & Sanz, 1990a;Brinkmann, 1992;Schwarz & Salisbury, 2005). Currently valid European species of Theriosuchus include: T. guimarotae from the Kimmeridgian of Portugal (Schwarz & Salisbury, 2005); T. pusillus from the Berriasian of England (Owen, 1879;Salisbury, 2002); T. ibericus from the Barremian of Spain (Brinkmann, 1989;Brinkmann, 1992); and T. sympiestodon from the Maastrichtian of Romania (Martin, Rabi & Csiki, 2010;Martin et al, 2014).…”

Section: European Atoposaurid Diversitymentioning

confidence: 99%

“…Currently valid European species of Theriosuchus include: T. guimarotae from the Kimmeridgian of Portugal (Schwarz & Salisbury, 2005); T. pusillus from the Berriasian of England (Owen, 1879;Salisbury, 2002); T. ibericus from the Barremian of Spain (Brinkmann, 1989;Brinkmann, 1992); and T. sympiestodon from the Maastrichtian of Romania (Martin, Rabi & Csiki, 2010;Martin et al, 2014). However, support for the monophyly of these species of Theriosuchus has yet to be adequately evaluated.…”

Section: European Atoposaurid Diversitymentioning

confidence: 99%

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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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Section: Skullmentioning

confidence: 99%

Section: Skullmentioning

confidence: 99%

Section: European Atoposaurid Diversitymentioning

confidence: 99%

Section: European Atoposaurid Diversitymentioning

confidence: 99%

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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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“…This type of teeth is typically assigned to Atoposauridae close related to members of the genus Theriosuchus. As occurs with Goniopholis, a particular species of Theriosuchus, T. guimarotae has been described in Guimarota (Schwarz and Salisbury, 2005) but at present no comparison can be made with the Andrés specimens.…”

Section: Crocodylomorphsmentioning

confidence: 99%

Vertebrate fauna at the Allosaurus fossil-site of Andrés (Upper Jurassic), Pombal, Portugal

Malafaia¹,

Ortega²,

Escaso³

et al. 2010

J. iber. geol.

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An overview of the faunistic diversity of the Andrés fossil-site from the Portuguese Upper Jurassic is presented. This work provides a preliminary approach on the vertebrate fauna known at present. Although this quarry is known since the 1990's, due to the description of the first robust evidence of a member of the neotetanuran genus Allosaurus outside North America, the results presented here are mainly derived from the analysis of the elements found during the second and third field seasons in 2005.At the moment, among the material collected from Andrés it was identified remains that represent a diverse vertebrate fauna, including fishes, sphenodonts, crocodylomorphs, pterosaurs, and at least, seven distinct dinosaur forms. The recovery of this diverse and abundant osteological collection from one unique fossil-site is noteworthy for the Upper Jurassic Portuguese record, and only comparable with those from the Guimarota coalmine. Due to these two features plus the good preservation of the fossils, the Andrés quarry may be a site of reference for the analysis of vertebrate ecosystems from the Portuguese Upper Jurassic. Dinosaur elements are the most abundant fossils, and among them it is particularly common the presence of remains identified as Allosaurus. These new evidences allow testing the previous phylogenetical hypothesis ascribing the firsts theropod remains from Andrés to A. fragilis, a species described in synchronic levels of the North American Morrison Formation.

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A review of the non‐semiaquatic adaptations of extinct crocodylomorphs throughout their fossil record

Pochat‐Cottilloux

2024

The Anatomical Record

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Crocodylomorphs constitute a clade of archosaurs that have thrived since the Mesozoic until today and have survived numerous major biological crises. Contrary to historic belief, their semiaquatic extant representatives (crocodylians) are not living fossils, and, during their evolutionary history, crocodylomorphs have evolved to live in a variety of environments. This review aims to summarize the non‐semiaquatic adaptations (i.e., either terrestrial or fully aquatic) of different groups from different periods, highlighting how exactly those different lifestyles are inferred for those animals, with regard to their geographic and temporal distribution and phylogenetic relationships. The ancestral condition for Crocodylomorpha seems to have been a terrestrial lifestyle, linked with several morphological adaptations such as an altirostral skull, long limbs allowing a fully erect posture and a specialized dentition for diets based on land. However, some members of this clade, such as thalattosuchians and dyrosaurids display adaptations for an opposite, aquatic lifestyle, interestingly inferred from the same type of morphological observations. Finally, new techniques for inferring the paleobiology of those extinct animals have been put forward in the last decade, appearing as a complementary approach to traditional morphological descriptions and comparisons. Such is the case of paleoneuroanatomical (CT scan data), histological, and geochemical studies.

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A new species of Theriosuchus (Atoposauridae, Crocodylomorpha) from the Late Jurassic (Kimmeridgian) of Guimarota, Portugal

Cited by 76 publications

References 16 publications

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

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

Vertebrate fauna at the Allosaurus fossil-site of Andrés (Upper Jurassic), Pombal, Portugal

A review of the non‐semiaquatic adaptations of extinct crocodylomorphs throughout their fossil record

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