The first crocodylomorph from the Mesozoic of Turkey (Barremian of Zonguldak) and the dispersal of the eusuchians during the Cretaceous

Jouve, Stéphane; Sarıgül, Volkan; Steyer, Jean‐Sébastien; Şen, Şevket

doi:10.1080/14772019.2017.1393469

Cited by 11 publications

(3 citation statements)

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“…The highly stepped posterior portion of the mandible superficially resembles a mammalian coronoid process and is unique and likely apomorphic, distinguishing Scolomastax from other Cretaceous brevirostrine neosuchians. In Acynodon the dorsal surface of the surangular forms a slight convexity followed by an elongate and shallow depression, creating a nearly flat profile in lateral view (Jouve et al, 2017;Martin, 2007;} Osi, 2014). Iharkutosuchus possess a posterior portion of the mandible that is step-shaped in profile; however, it is much lower with the surangular forming a short, inset ridge and representing no more than about 35%-40% the dorsoventral mandible height.…”

Section: Descriptionmentioning

confidence: 99%

An Enigmatic Small Neosuchian Crocodyliform from the Woodbine Formation of Texas

Noto

Drumheller

Adams

et al. 2019

The Anatomical Record

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New discoveries at the Arlington Archosaur Site (AAS), a Cenomanian (Late Cretaceous) locality in north‐central Texas, are filling gaps in our knowledge of mid‐Cretaceous Appalachian ecosystems, which remain poorly characterized. The AAS is notable because it preserves a diverse crocodyliform record. As seen in other sites that preserve four or more crocodyliform taxa, the species present at the AAS exhibit different snout shapes and body sizes, indicating that this high diversity of sympatric species was likely sustainable due to niche partitioning. Here we describe Scolomastax sahlsteini gen. et sp. nov., a new species of crocodyliform from the AAS, currently known from a partial right mandibular ramus. This species differs from other crocodyliforms in possessing features associated with durophagy or omnivory, including a shortened mandible, reduced tooth count, heterodonty, a dorsally expanded surangular, and enlarged attachments for jaw adductor muscles. Our phylogenetic analysis places this new taxon within Eusuchia as a member of Paralligatoridae and sister taxon to Paralligator gradilifrons. Scolomastax sahlsteini extends the record of paralligatorids into the Late Cretaceous of North America. This discovery represents the first appearance of this clade on the poorly known landmass of Appalachia, supporting a biogeographic connection between North America and Asia in the Early Cretaceous prior to completion of the Western Interior Seaway. However, relationships among other endemic crocodyliforms and tree instability within Paralligatoridae suggest further analysis is needed to resolve phylogenetic and biogeographic relationships (http://zoobank.org/urn:lsid:zoobank.org:pub:DC114471-6687-4BB5-8FAE-96F7278B1DAF). Anat Rec, 303:801–812, 2020. © 2019 Wiley Periodicals, Inc.

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Section: Descriptionmentioning

confidence: 99%

An Enigmatic Small Neosuchian Crocodyliform from the Woodbine Formation of Texas

Noto

Drumheller

Adams

et al. 2019

The Anatomical Record

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“…Thus, conservatively, the origin of Eusuchia can be traced to the European archipelago and/or the surrounding coasts of the Tethys Ocean. The oldest-known eusuchians are European (depending on the phylogeny, either Portugalosuchus azenhae from the late Cenomanian of Portugal [ 23 ], or Hylaeochampsa vectiana and Turcosuchus okani from the Barremian of the UK and Turkey, respectively [ 26 ]), supporting a European origin, as do putative hylaeochampsid remains from the Middle Jurassic of the UK [ 85 ]. Given our estimated area of origin, and several Early Cretaceous remains from Asia [ 25 ], it is likely that there was a substantial eastward dispersal of eusuchians during the Early Cretaceous [ 26 ].…”

Section: Discussionmentioning

confidence: 99%

“…For example, the area where neosuchians first evolved is still debated, because the Jurassic record of non-pelagic taxa is poor and the major groups within Neosuchia all have different putative geographical origins [22]. Eusuchia potentially originated either in Europe [23] or Gondwana [24], and Early Cretaceous specimens from Asia [25,26] suggest that the latter area might also be a possible centre of origin. Tethysuchia evolved either in Africa [17,[27][28][29] or North America [30] and Goniopholididae either in North America or central Asia [30,31].…”

Section: Introductionmentioning

confidence: 99%

The biogeographic history of neosuchian crocodiles and the impact of saltwater tolerance variability

Groh,

Upchurch,

Day

et al. 2023

R. Soc. open sci.

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Extant neosuchian crocodiles are represented by only 24 taxa that are confined to the tropics and subtropics. However, at other intervals during their 200 Myr evolutionary history the clade reached considerably higher levels of species-richness, matched by more widespread distributions. Neosuchians have occupied numerous habitats and niches, ranging from dwarf riverine forms to large marine predators. Despite numerous previous studies, several unsolved questions remain with respect to their biogeographic history, including the geographical origins of major groups, e.g. Eusuchia and Neosuchia itself. We carried out the most comprehensive biogeographic analysis of Neosuchia to date, based on a multivariate K-means clustering approach followed by the application of two ancestral area estimation methods (BioGeoBEARS and Bayesian ancestral location estimation) applied to two recently published phylogenies. Our results place the origin of Neosuchia in northwestern Pangaea, with subsequent radiations into Gondwana. Eusuchia probably emerged in the European archipelago during the Late Jurassic/Early Cretaceous, followed by dispersals to the North American and Asian landmasses. We show that putative transoceanic dispersal events are statistically significantly less likely to happen in alligatoroids. This finding is consistent with the saltwater intolerant physiology of extant alligatoroids, bolstering inferences of such intolerance in their ancestral lineages.

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A new Crocodyloidea from the middle Eocene of Zamora (Duero Basin, Spain)

Narváez,

de Celis,

Escaso

et al. 2024

The Anatomical Record

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The eusuchian crocodyliforms recorded in the Eocene levels of the Spanish Duero Basin belong to three lineages: Planocraniidae, with the species Duerosuchus piscator; Alligatoroidea, represented by several specimens of the genus Diplocynodon; and Crocodyloidea, which includes several specimens traditionally attributed to Asiatosuchus. The genus Asiatosuchus, established in 1940 based on a middle Eocene species from Mongolia, has subsequently served as a wastebasket taxon for Paleogene remains belonging to several species, not only from Asia but also belonging to the European and North American records. Many of these species are known by highly fragmentary remains, sharing the presence of characters such as a flat and triangular skull, and long symphyses in the lower jaw, recognized as characteristic for the crocodyloids. In addition to isolated cranial remains, among the material traditionally attributed to Asiatosuchus at the Duero Basin stands out a nearly complete skull and a left mandible, from the middle Eocene area of Casaseca de Campeán (Zamora Province). The present study analyses in detail these specimens, previously reported during the 1980s, but analyzed in a very preliminary way. They are included for the first time in a phylogenetic analysis to establish the systematic position of this Spanish form. The results confirm that it corresponds to a new species of basal crocodyloid, defined here as Asiatosuchus oenotriensis sp. nov.

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The first crocodylomorph from the Mesozoic of Turkey (Barremian of Zonguldak) and the dispersal of the eusuchians during the Cretaceous

Abstract: Queries are marked in the margins of the proofs, and you can also click the hyperlinks below.

Cited by 11 publications

References 61 publications

An Enigmatic Small Neosuchian Crocodyliform from the Woodbine Formation of Texas

An Enigmatic Small Neosuchian Crocodyliform from the Woodbine Formation of Texas

The biogeographic history of neosuchian crocodiles and the impact of saltwater tolerance variability

A new Crocodyloidea from the middle Eocene of Zamora (Duero Basin, Spain)

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