A re-evaluation of goniopholidid crocodylomorph material from Central Asia: Biogeographic and phylogenetic implications

Halliday, Thomas J. D.; Andrade, Marco B D; Benton, Michael J.; Efimov, M. B.

doi:10.4202/app.2013.0018

Cited by 9 publications

(8 citation statements)

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“…However this may be, the biogeographic pattern presented above might furthermore be mirrored by goniopholid crocodiles [ 65 ] and some pterosaur clades [ 66 ], which also seem to have expanded their range from eastern Asia towards Europe in the Late Jurassic. Palaeogeographic reconstructions indicate that at least a narrow marine barrier, probably with numerous islands, existed between Asia and Europe up to the Tithonian, when these landmasses might have been joined [ 67 ].…”

Section: Discussionmentioning

confidence: 99%

“…Palaeogeographic reconstructions indicate that at least a narrow marine barrier, probably with numerous islands, existed between Asia and Europe up to the Tithonian, when these landmasses might have been joined [ 67 ]. Whereas for crocodiles, different tolerances to brackish or even marine waters were evoked to explain the ability to cross the still remaining marine barrier through island hopping [ 65 ], flight ability was probably the key factor in the biogeographical evolution of pterosaurs [ 66 ]. For maniraptorans, small body size of the taxa at the base of all major lineages [ 68 ] might have made oversea dispersal by rafting possible [ 69 ], thus facilitating the crossing of the epicontinental barriers between Asia and Europe.…”

Section: Discussionmentioning

confidence: 99%

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Re-evaluation of the Haarlem Archaeopteryx and the radiation of maniraptoran theropod dinosaurs

Foth

Rauhut

2017

BMC Evol Biol

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Background Archaeopteryx is an iconic fossil that has long been pivotal for our understanding of the origin of birds. Remains of this important taxon have only been found in the Late Jurassic lithographic limestones of Bavaria, Germany. Twelve skeletal specimens are reported so far. Archaeopteryx was long the only pre-Cretaceous paravian theropod known, but recent discoveries from the Tiaojishan Formation, China, yielded a remarkable diversity of this clade, including the possibly oldest and most basal known clade of avialan, here named Anchiornithidae. However, Archaeopteryx remains the only Jurassic paravian theropod based on diagnostic material reported outside China.ResultsRe-examination of the incomplete Haarlem Archaeopteryx specimen did not find any diagnostic features of this genus. In contrast, the specimen markedly differs in proportions from other Archaeopteryx specimens and shares two distinct characters with anchiornithids. Phylogenetic analysis confirms it as the first anchiornithid recorded outside the Tiaojushan Formation of China, for which the new generic name Ostromia is proposed here.ConclusionsIn combination with a biogeographic analysis of coelurosaurian theropods and palaeogeographic and stratigraphic data, our results indicate an explosive radiation of maniraptoran coelurosaurs probably in isolation in eastern Asia in the late Middle Jurassic and a rapid, at least Laurasian dispersal of the different subclades in the Late Jurassic. Small body size and, possibly, a multiple origin of flight capabilities enhanced dispersal capabilities of paravian theropods and might thus have been crucial for their evolutionary success.Electronic supplementary materialThe online version of this article (10.1186/s12862-017-1076-y) contains supplementary material, which is available to authorized users.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Re-evaluation of the Haarlem Archaeopteryx and the radiation of maniraptoran theropod dinosaurs

Foth

Rauhut

2017

BMC Evol Biol

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“…The second parsimony analysis presented here employs the mA matrix: a modified version of the character and taxon list first published by Andrade et al (2011) , which originally included 104 OTUs scored for 486 characters. As per the recommendations of Andrade et al (2011) , Halliday et al (2015) , and Puértolas-Pascual, Canudo & Sender (2015) , the putative goniopholidid Denazinosuchus kirtlandicus ( Lucas & Sullivan, 2003 ), and the Asian taxon ‘ Goniopholis ’ phuwiangensis Buffetaut & Ingavat, 1983 OTUs, along with the composite ‘ Goniopholis ’ phuwiangensis + Siamosuchus terminal (ALT Siamosuchus ), were excluded due to their instability and, in the case of the latter, inapplicability. Following Halliday et al (2015) and Ristevski et al (2018) the putative goniopholidids Kansajasuchus extensus Efimov, 1975 , Sunosuchus shartegensis Efimov, 1988 and Turanosuchus aralensis Efimov, 1988 were excluded due to their instability.…”

Section: Phylogenetic Analysesmentioning

confidence: 99%

A new large-bodied thalattosuchian crocodyliform from the Lower Jurassic (Toarcian) of Hungary, with further evidence of the mosaic acquisition of marine adaptations in Metriorhynchoidea

Ősi

Young

Galácz

et al. 2018

PeerJ

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Based on associated and three-dimensionally preserved cranial and postcranial remains, a new thalattosuchian crocodyliform, Magyarosuchus fitosi gen. et sp. nov. from the Lower Jurassic (Upper Toarcian) Kisgerecse Marl Formation, Gerecse Mountains, Hungary is described here. Phylogenetic analyses using three different datasets indicate that M. fitosi is the sister taxon of Pelagosaurus typus forming together the basal-most sub-clade of Metriorhynchoidea. With an estimated body length of 4.67–4.83 m M. fitosi is the largest known non-metriorhynchid metriorhynchoid. Besides expanding Early Jurassic thalattosuchian diversity, the new specimen is of great importance since, unlike most contemporaneous estuarine, lagoonal or coastal thalattosuchians, it comes from an ‘ammonitico rosso’ type pelagic deposit of the Mediterranean region of the Tethys. A distal caudal vertebra having an unusually elongate and dorsally projected neural spine implies the presence of at least a rudimentary hypocercal tail fin and a slight ventral displacement of the distal caudal vertebral column in this basal metriorhynchoid. The combination of retaining heavy dorsal and ventral armors and having a slight hypocercal tail is unique, further highlighting the mosaic manner of marine adaptations in Metriorhynchoidea.

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“…In other atoposaurids, this margin, comprising the lateral edge of the postorbital and squamosal, is straight, similar to T. guimarotae (Schwarz & Salisbury, ) and T. pusillus . (S8) External mandibular fenestra present (C207.1) and oval‐shaped with anteroposteriorly orientated long axis (C210.0) : The presence of an external mandibular fenestra is also shared with T. guimarotae (Schwarz & Salisbury, ) amongst those taxa included in our analysis as putative atoposaurids, but also represents the plesiomorphic crocodyliform condition, being present in goniopholidids (e.g. Halliday et al ., ), Protosuchus (Colbert & Mook, ), as well as in notosuchians such as Baurusuchus (Nascimento & Zaher, ) and Labidiosuchus (Kellner et al ., ), in which the opening is enlarged. This fenestra is lost in some advanced neosuchians, including paralligatorids (Montefeltro et al ., ), but is present in most eusuchians and Crocodylia (Brochu, ; Salisbury et al ., ; Pol et al ., ), although in some cases it is strongly reduced (Brochu et al ., ). (S9*) Individual dorsal and caudal osteoderms with unsculpted edges (C304.1), square‐shaped (C308.3), and lacking a dorsal keel anteriorly (C311.0) and posteriorly (C312.0) : The individual osteoderms preserved in Alligatorium meyeri have unsculpted edges on all but the nuchal‐most elements, a feature that cannot be a preservation artefact as the cranial table remains sculpted, and the centre of each osteoderm remains relatively lightly sculpted.…”

Section: Systematic Palaeontologymentioning

confidence: 99%

Evolutionary relationships and systematics of Atoposauridae (Crocodylomorpha: Neosuchia): implications for the rise of Eusuchia

2016

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Atoposaurids are a group of small-bodied, extinct crocodyliforms, regarded as an important component of Jurassic and Cretaceous Laurasian semi-aquatic ecosystems. Despite the group being known for over 150 years, the taxonomic composition of Atoposauridae and its position within Crocodyliformes are unresolved. Uncertainty revolves around their placement within Neosuchia, in which they have been found to occupy a range of positions from the most basal neosuchian clade to more crownward eusuchians. This problem stems from a lack of adequate taxonomic treatment of specimens assigned to Atoposauridae, and key taxa such as Theriosuchus have become taxonomic 'waste baskets'. Here, we incorporate all putative atoposaurid species into a new phylogenetic data matrix comprising 24 taxa scored for 329 characters. Many of our characters are heavily revised or novel to this study, and several ingroup taxa have never previously been included in a phylogenetic analysis. Parsimony and Bayesian approaches both recover Atoposauridae as a basal clade within Neosuchia, more stemward than coelognathosuchians, bernissartiids, and paralligatorids. Atoposauridae is a much more exclusive clade than previously recognized, comprising just three genera (Alligatorellus, Alligatorium, and Atoposaurus) that were restricted to the Late Jurassic of western Europe, and went extinct at the Jurassic/Cretaceous boundary. A putative Gondwanan atoposaurid (Brillanceausuchus) is recovered as a paralligatorid. Our results exclude both Montsecosuchus and Theriosuchus from Atoposauridae. Theriosuchus is polyphyletic, forming two groupings of advanced neosuchians. Theriosuchus (restricted to Theriosuchus pusillus, Theriosuchus guimarotae, and Theriosuchus grandinaris) spanned the Middle Jurassic to early Late Cretaceous, and is known from Eurasia and North Africa. Two Cretaceous species previously assigned to Theriosuchus ('Theriosuchus' ibericus and 'Theriosuchus' sympiestodon) are shown to be nested within Paralligatoridae, and we assign them to the new genus Sabresuchus. The revised phylogenetic placement of Theriosuchus has several implications for our understanding of eusuchian evolution. Firstly, the presence of fully pterygoidean choanae, previously regarded as a defining characteristic of Eusuchia, is not found in some basal members of Eusuchia. However, eusuchians can be distinguished from Theriosuchus and other basal neosuchians in that their choanae are posteriorly positioned, with an anterior margin medial to the posterior edge of the suborbital fenestra. This feature distinguishes eusuchians from Theriosuchus and more basal neosuchians. Secondly, our refined understanding of Theriosuchus implies that this taxon possessed only amphicoelous presacral vertebrae, and therefore fully developed vertebral procoely is likely to have evolved only once in Crocodylomorpha, on the lineage leading to Eusuchia. These and other findings presented herein will provide an important framework for understanding the neosuchian-eusuchian transition.

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A re-evaluation of goniopholidid crocodylomorph material from Central Asia: Biogeographic and phylogenetic implications

Abstract: Central Asia is a key area for crocodylomorph evolution, lying midway between the highly documented deposits in Europe and

Cited by 9 publications

References 44 publications

Re-evaluation of the Haarlem Archaeopteryx and the radiation of maniraptoran theropod dinosaurs

Re-evaluation of the Haarlem Archaeopteryx and the radiation of maniraptoran theropod dinosaurs

A new large-bodied thalattosuchian crocodyliform from the Lower Jurassic (Toarcian) of Hungary, with further evidence of the mosaic acquisition of marine adaptations in Metriorhynchoidea

Evolutionary relationships and systematics of Atoposauridae (Crocodylomorpha: Neosuchia): implications for the rise of Eusuchia

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