Re: [dinosaur] Metriorhynchid crocodylomorph narial retraction + more

Note that ALL the papers in the new special issue ofÂthe Zoological Journal of the Linnean Society currently have free pdfs. In addition to papers listed in the first post below, other papers posted earlier on the DML in advance form are now out in final form with free pdfs:

Deslongchampsina gen. nov.
Yvridiosuchus gen. nov.

Deslongchampsina larteti comb. nov.
Yvridiosuchus boutilieri comb. nov.

Michela M. Johnson, Mark T. Young & Stephen L. Brusatte (2020)
Re-description of two contemporaneous mesorostrine teleosauroids (Crocodylomorpha: Thalattosuchia) from the Bathonian of England and insights into the early evolution of Machimosaurini
Zoological Journal of the Linnean Society 189(2): Â449â482
https://doi.org/10.1093/zoolinnean/zlz037
https://academic.oup.com/zoolinnean/article/189/2/449/5528354

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Mark T. Young, Davide Foffa, Lorna Steel & Steve Etches (2020)
Macroevolutionary trends in the genus Torvoneustes (Crocodylomorpha: Metriorhynchidae) and discovery of a giant specimen from the Late Jurassic of Kimmeridge, UK.
Zoological Journal of the Linnean Society 189(2): Â483â493
https://doi.org/10.1093/zoolinnean/zlz101
https://academic.oup.com/zoolinnean/article/189/2/483/5588829

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Mark T. Young, Sven Sachs, Pascal Abel, Davide Foffa, Yanina Herrera Â& James J. N. Kitson (2020)
Convergent evolution and possible constraint in the posterodorsal retraction of the external nares in pelagic crocodylomorphs.
Zoological Journal of the Linnean Society 189(2): Â494â520
doi: https://doi.org/10.1093/zoolinnean/zlaa021
https://academic.oup.com/zoolinnean/article/189/2/494/5856076

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E. PuÃrtolas-Pascual & O. Mateus (2020)
A three-dimensional skeleton of Goniopholididae from the Late Jurassic of Portugal: implications for the Crocodylomorpha bracing system.
Zoological Journal of the Linnean Society 189(2): Â521â548
doi: https://doi.org/10.1093/zoolinnean/zlz102
https://academic.oup.com/zoolinnean/article/189/2/521/5610606

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Alexandre R. D. Guillaume, Miguel Moreno-Azanza, Eduardo PuÃrtolas-Pascual & OctÃvio Mateus (2020)
Palaeobiodiversity of crocodylomorphs from the LourinhÃ Formation based on the tooth record: insights into the palaeoecology of the Late Jurassic of Portugal.
Zoological Journal of the Linnean Society 189(2): Â549â583
doi: Âhttps://doi.org/10.1093/zoolinnean/zlz112
https://academic.oup.com/zoolinnean/article/189/2/549/5648910

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Alejandro Blanco, Eduardo PuÃrtolas-Pascual, Josep Marmi, Blanca Moncunill-SolÃ, Sergio LlÃcer & Gertrud E. RÃssner (2020)
Zoological Journal of the Linnean Society 189(2): Â584â617
Late Cretaceous (Maastrichtian) crocodyliforms from north-eastern Iberia: a first attempt to explain the crocodyliform diversity based on tooth qualitative traits.
doi: https://doi.org/10.1093/zoolinnean/zlz106
https://academic.oup.com/zoolinnean/article/189/2/584/5628213

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IvÃn NarvÃez, Christopher A Brochu, Ane De Celis, Vlad Codrea, Fernando Escaso, AdÃn PÃrez-GarcÃa & Francisco Ortega (2020)
New diagnosis for Allodaposuchus precedens, the type species of the European Upper Cretaceous clade Allodaposuchidae.
Zoological Journal of the Linnean Society 189(2): Â618â634
doi: https://doi.org/10.1093/zoolinnean/zlz029
https://academic.oup.com/zoolinnean/article/189/2/618/5499063

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Ane De Celis, IvÃn NarvÃez & Francisco Ortega (2020)
Spatiotemporal palaeodiversity patterns of modern crocodiles (Crocodyliformes: Eusuchia)
Zoological Journal of the Linnean Society 189(2): Â635â656
doi: https://doi.org/10.1093/zoolinnean/zlz038
https://academic.oup.com/zoolinnean/article/189/2/635/5528278

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Giovanne M. Cidade, Daniel Fortier & Annie S. Hsiou (2020)
Taxonomic and phylogenetic review of Necrosuchus ionensis (Alligatoroidea: Caimaninae) and the early evolution and radiation of caimanines.
Zoological Journal of the Linnean Society 189(2): Â657â669
doi: https://doi.org/10.1093/zoolinnean/zlz051
https://academic.oup.com/zoolinnean/article/189/2/657/5546088

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Roland B Sookias (2020)
Zoological Journal of the Linnean Society 189(2): Â670â699
Exploring the effects of character construction and choice, outgroups and analytical method on phylogenetic inference from discrete characters in extant crocodilians
doi: Âhttps://doi.org/10.1093/zoolinnean/zlz015
https://academic.oup.com/zoolinnean/article/189/2/670/5492616

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Christopher A. Brochu & Colin D. Sumrall (2020)
Modern cryptic species and crocodylian diversity in the fossil record.
Zoological Journal of the Linnean Society 189(2): Â700â711
doi: https://doi.org/10.1093/zoolinnean/zlaa039
https://academic.oup.com/zoolinnean/article/189/2/700/5836565

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E. PuÃrtolas-Pascual & O. Mateus (2020)
Erratum to: A three-dimensional skeleton of Goniopholididae from the Late Jurassic of Portugal: implications for the Crocodylomorpha bracing system.
Zoological Journal of the Linnean Society 189(2): Â 712
doi: https://doi.org/10.1093/zoolinnean/zlz156
https://academic.oup.com/zoolinnean/article/189/2/712/5643513

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On Thu, Jun 11, 2020 at 9:37 AM Ben Creisler <bcreisler@gmail.com> wrote:

Ben Creisler
bcreisler@gmail.com

Special Issue:
First European Symposium on the Evolution of Crocodylomorpha
Zoological Journal of the Linnean Society 189(2)

https://academic.oup.com/zoolinnean/issue/189/2

Most of the content was posted as individual articles in earlier form on the DML.Â

Of note or new:

Eduardo PuÃrtolas-Pascual, Mark T Young & Christopher A Brochu (2020)
Introducing the First European Symposium on the Evolution of Crocodylomorpha
Zoological Journal of the Linnean Society 189(2): 419â427
doi: https://doi.org/10.1093/zoolinnean/zlaa012
https://academic.oup.com/zoolinnean/article-abstract/189/2/419/5856072

The First European Symposium on the Evolution of Crocodylomorpha took place during the XVI Annual Meeting of the European Association of Vertebrate Palaeontologists (EAVP) organized by NOVA University of Lisbon (UNL) in Caparica, Portugal. Fourteen lectures and five posters were presented at the symposium in June 26th--July 1st, 2018. This special issue showcases twelve papers based on symposium contributions.

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New paper:

Mark T. Young, Sven Sachs, Pascal Abel, Davide Foffa, Yanina Herrera & James J. N. Kitson (2020)
Convergent evolution and possible constraint in the posterodorsal retraction of the external nares in pelagic crocodylomorphs.
Zoological Journal of the Linnean Society 189(2): 494--520
doi: https://doi.org/10.1093/zoolinnean/zlaa021
https://academic.oup.com/zoolinnean/article-abstract/189/2/494/5856076

Amongst Mesozoic marine reptiles, metriorhynchid crocodylomorphs were unique in evolving into pelagically adapted forms with little-to-no posterodorsal retraction of the external nares. Narial retraction is a common adaptation seen in sustained swimmers, notably occurring during cetacean evolution. Mesosaurids and the basalmost known members of ichthyosauriforms, thalattosaurians, saurosphargids, sauropterygians, pleurosaurids and mosasauroids had the external nares divided by an ossified bar, bound by multiple cranial bones and were positioned back from the tip of the rostrum. However, metriorhynchids evolved from taxa with a single external naris bound solely by the premaxilla, and positioned near the tip of an elongate rostrum. We posit that metriorhynchids were uniquely disadvantaged in evolving into sustained swimmers. Herein we describe three Late Jurassic metriorhynchid cranial rostra that display differing degrees of narial retraction. In our new phylogenetic analyses, the backwards migration of the narial fossa posterior margin occurred independently at least four times in Metriorhynchidae, whereas the backwards migration of the anterior margin only occurred twice. Although Rhacheosaurini share the backwards migration of the anterior and posterior narial margins, posterodorsal retraction occurred differently along three lineages. This culminated in the Early Cretaceous, where a rhacheosaurin evolved nares bound by the premaxilla and maxilla, and significantly posterodorsally retracted.

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(posted earlier on DML behind paywall)ÂÂ

Free pdf:

Christopher A. Brochu & Colin D. Sumrall (2020)
Modern cryptic species and crocodylian diversity in the fossil record
Zoological Journal of the Linnean Society 189(2): 700--711
doi: https://doi.org/10.1093/zoolinnean/zlaa039
https://academic.oup.com/zoolinnean/article/189/2/700/5836565

Advances in molecular biology and genetics are revealing that many recognized crocodylian species are complexes of two or more cryptic species. These discoveries will have a profound impact on interpretation of the crocodyliform fossil record. Our understanding of ranges of intraspecific variation in modern crocodylian morphology may be based on multiple species and thus express both intraspecific and interspecific variation. This raises questions about our ability to recognize modern species in the fossil record, and it also indicates that specimens from disparate localities or horizons may represent not single widespread species, but multiple related species. Ranges of variation in modern species require a thorough re-evaluation, and we may have to revisit previous perceptions of past crocodyliform diversity, rates of evolution or anagenetic lineages in stratigraphic succession. These challenges will not be unique to those studying crocodyliforms and will require sophisticated approaches to variation among modern and fossil specimens.

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