Colymbosaurines from the Upper Jurassic of European Russia and their implication for palaeobiogeography of marine reptiles

Arkhangelsky, M. S.; Zverkov, Nikolay G.; Rogov, Mikhail; Stenshin, Ilya M.; Baykina, Evgeniya M.

doi:10.1007/s12549-019-00397-0

Cited by 8 publications

(8 citation statements)

References 66 publications

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“…New discoveries further support the idea that many ophthalmosaurids have had a widespread distribution. For more details on palaeobiogeography of Boreal ichthyosaurs, we direct the reader to (Zverkov et al, 2015; Zverkov & Efimov, 2019; Arkhangelsky et al, in press).…”

Section: Discussionmentioning

confidence: 99%

A prevalence ofArthropterygius(Ichthyosauria: Ophthalmosauridae) in the Late Jurassic—earliest Cretaceous of the Boreal Realm

Zverkov

Prilepskaya

2019

PeerJ

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The ichthyosaur genusArthropterygiusMaxwell, 2010 is considered as rare and poorly known. However, considering the existing uncertainty regarding its position in respect to ophthalmosaurid subfamilies in recent phylogenies, it is among the key taxa for understanding the evolution of derived Late Jurassic and Early Cretaceous ichthyosaurs. Recently excavated unique material from the Berriassian of Franz Josef Land (Russian Extreme North) and examination of historical collections in Russian museums provided numerous specimens referable toArthropterygius. The new data combined with personal examination of ichthyosaursPalvennia,Janusaurus, andKeilhauiafrom Svalbard give us reason to refer all these taxa toArthropterygius. Therefore, we recognize four species within the genus:Arthropterigius chrisorum(Russell, 1994),A. volgensis(Kasansky, 1903) comb. nov.,A. hoybergeti(Druckenmiller et al., 2012) comb. nov., andA. lundi(Roberts et al., 2014) comb. nov. Three of the species are found both in the Arctic and in the European Russia. This allows the suggestion thatArthropterygiuswas common and widespread in the Boreal Realm during the Late Jurassic and earliest Cretaceous. The results of our multivariate analysis of ophthalmosaurid humeral morphology indicate that at least some ophthalmosaurid genera and species, includingArthropterygius, could be easily recognized based solely on humeral morphology. Our phylogenetic analyses place the clade ofArthropterygiusclose to the base of Ophthalmosauria as a sister group either to ophthalmosaurines or to platypterygiines. Although its position is still uncertain, this is the best supported clade of ophthalmosaurids (Bremer support value of 5, Bootstrap and Jackknife values exceeding 80) that further augments our taxonomic decision.

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Section: Discussionmentioning

confidence: 99%

A prevalence ofArthropterygius(Ichthyosauria: Ophthalmosauridae) in the Late Jurassic—earliest Cretaceous of the Boreal Realm

Zverkov

Prilepskaya

2019

PeerJ

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“…The postaxial flange forms a triangular and concave facet posterior to the distal ridge. An anteroposteriorly elongated distal ridge is regarded as an autapomorphic feature of Colymbosaurus megadeirus ( Benson & Bowdler, 2014 ; Roberts et al, 2017 ; Arkhangelsky et al, 2019 ) but the lack of an extensive postaxial flange precludes such a referral; the size of the humerus and its similarities with MNHNL DOU307 suggest rhomaleosaurid affinities.…”

Section: Comparative Descriptionsmentioning

confidence: 99%

Refining the marine reptile turnover at the Early–Middle Jurassic transition

Fischer

Weis

Thuy

2021

PeerJ

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Even though a handful of long-lived reptilian clades dominated Mesozoic marine ecosystems, several biotic turnovers drastically changed the taxonomic composition of these communities. A seemingly slow paced, within-geological period turnover took place across the Early–Middle Jurassic transition. This turnover saw the demise of early neoichthyosaurians, rhomaleosaurid plesiosaurians and early plesiosauroids in favour of ophthalmosaurid ichthyosaurians and cryptoclidid and pliosaurid plesiosaurians, clades that will dominate the Late Jurassic and, for two of them, the entire Early Cretaceous as well. The fossil record of this turnover is however extremely poor and this change of dominance appears to be spread across the entire middle Toarcian–Bathonian interval. We describe a series of ichthyosaurian and plesiosaurian specimens from successive geological formations in Luxembourg and Belgium that detail the evolution of marine reptile assemblages across the Early–Middle Jurassic transition within a single area, the Belgo–Luxembourgian sub-basin. These fossils reveal the continuing dominance of large rhomaleosaurid plesiosaurians, microcleidid plesiosaurians and Temnodontosaurus-like ichthyosaurians up to the latest Toarcian, indicating that the structuration of the upper tier of Western Europe marine ecosystems remained essentially constant up to the very end of the Early Jurassic. These fossils also suddenly record ophthalmosaurid ichthyosaurians and cryptoclidid plesiosaurians by the early Bajocian. These results from a geographically-restricted area provide a clearer picture of the shape of the marine reptile turnover occurring at the early–Middle Jurassic transition. This event appears restricted to the sole Aalenian stage, reducing the uncertainty of its duration, at least for ichthyosaurians and plesiosaurians, to 4 instead of 14 million years.

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“…The postaxial flange forms a triangular and concave facet posterior to the distal ridge. An anteroposteriorly elongated distal ridge is regarded as an autapomorphic feature of Colymbosaurus megadeirus (Benson & Bowdler, 2014;Roberts et al, 2017;Arkhangelsky et al, 2019) but the lack of an extensive postaxial flange precludes such a referral; the size of the humerus and its similarities with MNHNL DOU307 suggest rhomaleosaurid affinities. Dispansum-Pseudoradiosa-Aalensis zones, upper Toarcian, Belgium ICHTHYOSAURIA De Blainville, 1835 Ichthyosauria indet.…”

Section: Comparative Descriptions Thouarsense Zone Fauna Upper Toarcian Luxembourgmentioning

confidence: 99%

“…120° angle with the ulnar facet. However, a distal ridge is absent, unlike in Colymbosaurus (Benson & Bowdler, 2014;Arkhangelsky et al, 2019). The shape of the propodial with its fairly slender shaft and large preaxial and postaxial flanges indicate cryptocleidid affinities (Andrews, 1910a;Mehl, 1912;Brown, 1981;O'Keefe & Wahl, 2003;Knutsen, Druckenmiller & Hurum, 2012c;Roberts et al, 2017Roberts et al, , 2020 (Table 2), notably resembling the humerus of humerus of Muraenosaurus leedsi (Seeley, 1874b;Andrews, 1910a) and the femur of Tricleidus seeleyi (Owen, 1865).…”

Section: Peerj Reviewing Pdf | (mentioning

confidence: 99%

Peer Review #2 of "Refining the marine reptile turnover at the Early–Middle Jurassic transition (v0.2)"

Roberts¹

2021

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Even though a handful of long-lived reptilian clades dominated Mesozoic marine ecosystems, several biotic turnovers drastically changed the taxonomic composition of these communities. A seemingly slow paced, within-geological period turnover took place across the Early-Middle Jurassic transition. This turnover saw the demise of early neoichthyosaurians, rhomaleosaurid plesiosaurians and early plesiosauroids in favour of ophthalmosaurid ichthyosaurians and cryptoclidid and pliosaurid plesiosaurians, clades that will dominate the Late Jurassic and, for two of them, the entire Early Cretaceous as well. The fossil record of this turnover is however extremely poor, and this change of dominance appears to be spread across the entire middle Toarcian-Bathonian interval. We describe a series of ichthyosaurian and plesiosaurian specimens from successive geological formations in Luxembourg and Belgium that detail the evolution of marine reptile assemblages across the Early-Middle Jurassic transition within a single area, the Belgo-Luxembourgian sub-basin. These fossils reveal the continuing dominance of large rhomaleosaurid plesiosaurians, microcleidid plesiosaurians, and Temnodontosaurus-like ichthyosaurians up to the latest Toarcian, indicating that the structuration of the upper tier of Western Europe marine ecosystems remained essentially constant up to the very end of the Early Jurassic. These fossils also suddenly record ophthalmosaurid ichthyosaurians and cryptoclidid plesiosaurians by the early Bajocian. These results from a geographicallyrestricted area provide a clearer picture of the shape of the marine reptile turnover occurring at the early-Middle Jurassic transition. This event appears restricted to the sole Aalenian stage, reducing the uncertainty of its duration, at least for ichthyosaurians and plesiosaurians, to 4 instead of 14 million years.

show abstract

Colymbosaurines from the Upper Jurassic of European Russia and their implication for palaeobiogeography of marine reptiles

Cited by 8 publications

References 66 publications

A prevalence ofArthropterygius(Ichthyosauria: Ophthalmosauridae) in the Late Jurassic—earliest Cretaceous of the Boreal Realm

A prevalence ofArthropterygius(Ichthyosauria: Ophthalmosauridae) in the Late Jurassic—earliest Cretaceous of the Boreal Realm

Refining the marine reptile turnover at the Early–Middle Jurassic transition

Peer Review #2 of "Refining the marine reptile turnover at the Early–Middle Jurassic transition (v0.2)"

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