A new ophthalmosaurid ichthyosaur species from the Late Jurassic of Owadów-Brzezinki Quarry, Poland

Tyborowski, Daniel

doi:10.4202/app.00252.2016

Cited by 25 publications

(18 citation statements)

References 26 publications

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“…Other valid species. Undorosaurus nessovi Efimov, 1999b; Undorosaurus trautscholdi Arkhangelsky & Zverkov, 2014; Undorosaurus kielanae (Tyborowski, 2016) comb. nov.…”

Section: Type Species Undorosaurus Gorodischensis Efimov 1999bmentioning

confidence: 99%

“…Ophthalmosauridae is a highly derived clade of ichthyosaurs that appeared in the Middle Jurassic (Fernández 1999(Fernández , 2003Druckenmiller & Maxwell 2014) and dominated until the extinction of ichthyosaurs in the early Late Cretaceous (Fischer et al 2016). In the last decade, new ophthalmosaurid taxa have been erected from the Arctic (Maxwell 2010;Druckenmiller et al 2012;Roberts et al 2014;Delsett et al 2017) and Europe (Paparella et al 2017;Tyborowski 2016), that have illuminated the previously underestimated taxonomic diversity of Late Jurassic ichthyosaurs. This 'renaissance' in the study of Late Jurassic ichthyosaurs was preceded by a conservative period when their diversity was considered to be 'on the low side' (Maisch & Matzke Figure 1.…”

Section: Introductionmentioning

confidence: 99%

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Revision ofUndorosaurus, a mysterious Late Jurassic ichthyosaur of the Boreal Realm

Zverkov

Efimov²

2019

Journal of Systematic Palaeontology

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Recent study of ophthalmosaurid ichthyosaurs has brought us a number of new taxa, however, the validity of several ophthalmosaurid taxa from the Volgian (Tithonian) of European Russia still remains unclear, complicating the comparisons and in some cases affecting taxonomic decisions of new contributions. A revision of the type series of all three species of Undorosaurus, erected by Efimov in 1999, reveals the potential validity of two of them. This contradicts previous research, which concluded that only the type species, U. gorodischensis, is valid. Furthermore, examination of the holotype of Cryopterygius kristiansenae from the coeval strata of Svalbard show that it is synonymous with Undorosaurus gorodischensis sharing all diagnostic features of the species, especially those related to forelimb morphology: humerus with extensive anteroposteriorly elongate proximal end, poorly pronounced trochanter dorsalis and reduced deltopectoral crest; and ulna proximodistally elongate and not involved in perichondral ossification on its whole posterior edge. This supports the idea of intensive exchange of ichthyosaurs between the Middle Russian Sea and other Boreal seas in the Late Jurassic. In order to resolve the phylogenetic position of Undorosaurus within Ophthalmosauridae as well as relations of other ophthalmosaurids, a new dataset including 33 taxa and 106 characters, 23 of which are new, was compiled. The results of this analysis challenge all previous phylogenetic hypotheses for Ophthalmosauridae in a number of aspects including Undorosaurus spp. recovered deeply nested within Platypterygiinae as a sister group to derived platypterygiines.

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“…Other valid species. Undorosaurus nessovi Efimov, 1999b; Undorosaurus trautscholdi Arkhangelsky & Zverkov, 2014; Undorosaurus kielanae (Tyborowski, 2016) comb. nov.…”

Section: Type Species Undorosaurus Gorodischensis Efimov 1999bmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Revision ofUndorosaurus, a mysterious Late Jurassic ichthyosaur of the Boreal Realm

Zverkov

Efimov²

2019

Journal of Systematic Palaeontology

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“…The distal end bears three articular facets for the preaxial accessory element, radius and ulna typical of most ophthalmosaurids, including other SML specimens (Roberts et al, 2014;Fernández & Campos, 2015;Moon & Kirton, 2016;Paparella et al, 2016;Delsett et al, 2017) in contrast to e.g. Cryopterygius kielanae and Nannopterygius enthekiodon (Kirton, 1983;Tyborowski, 2016). The facet for the preaxial element is anteriorly deflected as in e.g.…”

Section: Ontogenymentioning

confidence: 99%

Peer Review #2 of "A new specimen of Palvennia hoybergeti: implications for cranial and pectoral girdle anatomy in ophthalmosaurid ichthyosaurs (v0.1)"

Lomax¹

2018

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The Late Jurassic Slottsmøya Member Lagerstätte on Spitsbergen preserves a diverse array of marine reptiles, including four amed taxa of ophthalmosaurid ichthyosaurs. One of these, Palvennia hoybergeti, is based on the single holotype specimen (SVB 1451) with an incomplete skull. A newly discovered specimen (PMO 222.669) with a disarticulated but largely complete skull and anterior postcranium is described, which considerably expands our knowledge of this taxon. Two additional new ophthalmosaurid specimens with pectoral girdles from the same member are described. The taxonomic utility of the ophthalmosaurid pectoral girdle is contentious, and an assessment of seven pectoral girdles from the Slottsmøya Member provides a basis for addressing this question via a 2D landmark principal component analysis of baracromian coracoids. The analysis reveals a taxonomic signal in the coracoids but also highlights the degree of individual variation. Commonly used phylogenetic characters do not fully encapsulate the degree of variation seen in coracoids and in some cases combine analogous features.

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“…This horizon is highly fossiliferous and is dominated by skeletal remains of ichthyosaurians ( Ichthyopterygia : Ichthyosauria ), giant actinopterygian fish ( Actinopterygii : Halecomorphi ), and marine crocodylomorphs ( Crocodylomorpha : Thalattosuchia ), and it yielded a pancryptodiran turtle ( Testudinata : Pancryptodira ). The most frequent vertebrate fossils are ribs and other bones of ichthyosaurs (Tyborowski, ). The turtle bones are considerably rare and represented by isolated elements.…”

Section: Geology and Taphonomymentioning

confidence: 99%

“…Taphonomical evidence from the marine vertebrate assemblage of the bone‐bearing horizon indicates that the unit should be classified as a Konzentrat‐Lagerstätte sensu Seilacher (). Remains of the marine reptiles from the Owadów‐Brzezinki Quarry illustrate two preservational categories (Tyborowski, ): Isolated bones and bone fragments, Disarticulated partial skeletons. …”

Section: Geology and Taphonomymentioning

confidence: 99%

A new pancryptodiran turtle from the Late Jurassic of Poland and palaeobiology of early marine turtles

2017

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Although Western Europe has yielded numerous Jurassic turtle taxa, several represented by cranial material or complete skeletons, the fossil record of the Jurassic turtles remains scarce to the north and east from Germany. Although some Late Jurassic testudinates were historically described from Poland, they were, thus far, represented by fragmentary remains that never were properly figured or described in detail. Therefore, very little is known about the mid‐Mesozoic diversity of turtles in that region of the continent. A new pancryptodiran turtle genus and species, Owadowia borsukbialynickae, is described from the uppermost Jurassic (Tithonian, ca. 148 Ma) carbonate sediments of the Kcynia Formation in Owadów‐Brzezinki Quarry, near Tomaszów Mazowiecki in central Poland. The lower jaw morphology and palaeoecological setting inhabited by the new genus and species, together with the trophic relationships of the Jurassic pancryptodiran turtles, are discussed in an attempt to determine the potential range of mode of life of O. borsukbialynickae. We propose that the new specimen belongs to a new durophagous pancryptodiran turtle taxon. O. borsukbialynickae might have spent considerable time in the marine environment and specialized on eating hard‐shelled invertebrates like bivalves and decapod crustaceans, common to that setting.

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A new ophthalmosaurid ichthyosaur species from the Late Jurassic of Owadów-Brzezinki Quarry, Poland

Abstract: A new Late Jurassic ophthalmosaurid ichthyosaur Cryopterygius kielanae sp. nov. is described from carbonate deposits of Owadów-Brzezinki Quarry, Central Poland, corresponding in

Cited by 25 publications

References 26 publications

Revision ofUndorosaurus, a mysterious Late Jurassic ichthyosaur of the Boreal Realm

Revision ofUndorosaurus, a mysterious Late Jurassic ichthyosaur of the Boreal Realm

Peer Review #2 of "A new specimen of Palvennia hoybergeti: implications for cranial and pectoral girdle anatomy in ophthalmosaurid ichthyosaurs (v0.1)"

A new pancryptodiran turtle from the Late Jurassic of Poland and palaeobiology of early marine turtles

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