New material of the ziphodont mesoeucrocodylian Iberosuchus from the Eocene of Languedoc, southern France

Martin, Jérémy E.

doi:10.1016/j.annpal.2016.05.002

Cited by 15 publications

(23 citation statements)

References 33 publications

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“…Antunes ( 1975 ) (Université Claude Bernard Lyon 1 [UCBL]‐FSL 530948‐90080) was cut in four thin sections (see Supporting Information: Figure S1 ). This specimen comes from the middle Eocene (upper Bartonian) Robiac locality, mostly known for its mammalian fauna (Martin, 2016 ; Mathis, 1985 ; Remy, 2015 ; Sudre, 1969 ). Remains of Iberosuchus in this locality were mentioned by Antunes ( 1986 ) and Martin ( 2016 ).…”

Section: Methodsmentioning

confidence: 99%

“…This process is plesiomorphic to Crocodylomorpha (absent in rauisuchians, Scheyer & Desojo, 2011 ): indeed, most taxa in this group show the classical ornamentation of hollow pits and grooves and protruding ridges. However, some taxa belonging to Notosuchia Gasparini ( 1971 ) do not show this kind of ornamentation (baurusuchids, Cotts et al, 2017 ; Malawisuchus mwakasyungutiensis , Gomani, 1997 ; sebecids, Martin, 2014 , 2016 ; Simosuchus clarki , Buckley et al, 2000 ; sphagesaurids, Martinelli et al, 2018 ). These taxa are also thought to have had more terrestrial habits than their neosuchian relatives (Klock et al, 2022 ; Pol et al, 2012 ).…”

Section: Introductionmentioning

confidence: 99%

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A survey of osteoderm histology and ornamentation among Crocodylomorpha: A new proxy to infer lifestyle?

Pochat‐Cottilloux

Martin

Amiot

et al. 2022

Journal of Morphology

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Osteoderms of eight extant and extinct species of crocodylomorphs are studied histologically and morphologically. Most osteoderms display the typical “crocodilian” structure with a woven‐fibered matrix surrounded by an upper and a lower parallel fibered matrix. The dorsal ornamentation of those specimens consists of a pit‐and‐ridge structure, with corresponding remodeling mechanisms. However, an osteoderm of Iberosuchus, studied here for the first time, differs in being nearly devoid of ornamentation; moreover, it shows strong bundles of straight Sharpey's fibers perpendicular to the surface in its lateral and dorsal walls, along with a rough plywood‐like structure in its basal plate. This suggests that this osteoderm was more deeply anchored within the dermis than the other osteoderms studied hitherto. This peculiar structure might have been linked to a terrestrial ecology and a specific thermoregulation strategy. Some other notosuchians in our sample do not exhibit ornamentation on their osteoderms, as opposed to neosuchians. Considering current interpretations of osteoderm function(s) in crocodilians, our observations are discussed in reference to possible ecophysiological peculiarities of Notosuchia in general, and Iberosuchus in particular.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A survey of osteoderm histology and ornamentation among Crocodylomorpha: A new proxy to infer lifestyle?

Pochat‐Cottilloux

Martin

Amiot

et al. 2022

Journal of Morphology

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“…The Palaeocene-Eocene fossil record of European crocodyliforms revealed a moderately high diversity that included notosuchians, like Bergisuchus Kuhn, 1968 (Eocene of Germany) and Iberosuchus Antunes, 1975 (Eocene of France, Portugal and Spain) (Berg 1966;Kuhn 1968;Antunes 1975;Buffetaut 1988;Ortega et al 1996;Rossmann 2000;Martin 2015Martin , 2016, eusuchians represented by ziphodont planocraniids, like Boverisuchus Kuhn, 1938 (Eocene of France, Germany, Italy, Spain) (Brochu 2013), crocodyloids like Asiatosuchus Mook, 1940 (Palaeocene of France and Eocene of Germany) (Berg 1966;Delfino & Smith 2009;Delfino et al 2017) and Megadontosuchus arduini de Zigno, 1880 (middle Eocene of Italy) (Piras et al 2007), gavialoids like Eosuchus Dollo, 1907 (Palaeocene of France) (Delfino et al 2005;Brochu 2007) and alligatoroids, like Hassiacosuchus Weitzel, 1935 (Eocene of Germany) (Brochu 2004) and Diplocynodon Pomel, 1847, the latter having a more extended fossil record from the Palaeocene up to the middle Miocene (Martin et al 2014;Rio et al 2020 and references therein). Close to the Eocene-Oligocene boundary, the deteriorating climatic conditions produced a drop in the diversity of crocodylian assemblages (Martin 2010), and as a consequence the only clade that survived the so called "Grande Coupure" (Stehlin 1909) was Diplocynodon (Antunes & Cahuzac 1999;Piras & Buscalioni 2006;Martin 2010;Čerňanský et al 2012;Chroust et al 2019;Luján et al 2019;Macaluso et al 2019).…”

Section: Introductionmentioning

confidence: 99%

A new late Eocene alligatoroid crocodyliform from Transylvania

Venczel¹,

Codrea²

2022

Comptes Rendus Palevol

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Here we describe a new eusuchian crocodyliform, collected 130 years ago from a shallow marine limestone of the late Eocene (Priabonian) fossil locality of Cluj-Mănăștur, Transylvania, Romania. Diplocynodon kochi n. sp. is represented by a three-dimensionally preserved incomplete skull that may have belonged to a mature individual. The new taxon possesses a relatively narrow and elongated snout and a mediolaterally shallow but anteroposteriorly wide premaxillary-maxillary notch, strengthened by a prominent bony ridge. The nasals are excluded from the naris and the anterior tip of the frontal forms a broad, complex sutural contact with the nasals. Diplocynodon kochi n. sp. possesses, similarly to other members of the genus, 16-17 maxillary alveoli of which the fourth and fifth alveoli are enlarged and confluent; the lacrimal is longer than the prefrontal; the ectopterygoid is situated close to the posteriormost maxillary tooth alveoli, the dorsal margin of the infratemporal fenestra is bordered by the quadratojugal, preventing the quadrate from reaching the fenestra, and the foramen aëreum is situated on the dorsal surface of the quadrate. The occurrence of D. kochi n. sp. in the Priabonian of the eastern part of Central Europe suggests that the genus was still present and probably widespread across the continent that contributed probably to its survival (at least locally) across the Eocene/Oligocene boundary.

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“…gaillardi by Godinot 1988) and the artiodactyl Dichobune robertiana (Sudre 1988;Sudre & Ginsburg 1993), suggested the locality was slightly older than Lissieu (France), or could be correlated to La Défense or Bouxwiller (France), and thus possibly be close to the MP13 reference-level (late Lutetian) (BiochroM'97 1997). The faunal list of Aumelas is being developed and is currently composed of crocodilians (Martin 2016), chelonians (Hervet 2004) and at least 19 mammalian taxa (marsupials, bats, rodents, lipothyphlan, primates, artiodactyls and perissodactyls; see Crochet 1979;Sudre 1980Sudre , 1988Godinot 1988;Escarguel 1999;Maitre et al 2006Maitre et al , 2008Maitre 2014;Rémy et al 2016Rémy et al , 2019. This study is a contribution to a larger effort to review and revise the Aumelas fauna based on the collections at the University of Montpellier and new materials collected over the last decade.…”

Section: Introductionmentioning

confidence: 99%

The hyaenodonts (Mammalia) from the French locality of Aumelas (Hérault), with possible new representatives from the late Ypresian

2020

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We describe the carnivorous mammals from the Eocene French locality of Aumelas (Hérault, France). All the carnivores that have been recovered from the fossiliferous locality belong to the Hyaenodonta, a group that was very diverse during the Eocene of Europe. Three new species are described. Matthodon peignei n. sp. is intermediate in size between M. menui (Rich, 1971) and M. tritens Lange-Badré & Haubold, 1990. This is the first known occurrence of this genus in southwestern Europe. Oxyaenoides aumelasiensis n. sp. is distinct from other Oxyaenoides Matthes, 1967 species by its smaller size (15% smaller than O. bicuspidens Matthes, 1967). A third new species is proposed from Aumelas: Leonhardtina meridianum n. sp. The hyaenodonts from Aumelas appear to be morphologically similar to hyaenodonts from late Ypresian to early Lutetian of the northwestern Europe (European mammal reference level MP10 and MP11). These new species are incorporated into a phylogenetic analysis and are resolved within the clade Hyaenodontoidea. Our analysis interestingly recovered the Prionogalidae and Thereu therium as members of the Hyainailourinae. Based on the carnivorous faunal analysis, Aumelas is likely close to the Ypresian/Lutetian transition. However, because the hyaenodonts display unusual sizes that could result from provincialism, dates for Aumelas based on only these taxa should be treated cautiously, and will require confirmation based on a broader faunal analysis.

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New material of the ziphodont mesoeucrocodylian Iberosuchus from the Eocene of Languedoc, southern France

Abstract: International audienc

Cited by 15 publications

References 33 publications

A survey of osteoderm histology and ornamentation among Crocodylomorpha: A new proxy to infer lifestyle?

A survey of osteoderm histology and ornamentation among Crocodylomorpha: A new proxy to infer lifestyle?

A new late Eocene alligatoroid crocodyliform from Transylvania

The hyaenodonts (Mammalia) from the French locality of Aumelas (Hérault), with possible new representatives from the late Ypresian

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