An anatomical reappraisal of the dwarf crocodylian
            <i>Arambourgia gaudryi</i>
            from the Eocene of Quercy (France) using CT data and its implications for the phylogeny and paleoecology of basally branching alligatoroids

Conedera, Davide; Pochat-Cottilloux, Yohan; Rinder, Nicolas; Adrien, Jerôme; Martin, Jeremy E.

doi:10.1080/02724634.2024.2313612

Journal of Vertebrate Paleontology

2023

DOI: 10.1080/02724634.2024.2313612

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An anatomical reappraisal of the dwarf crocodylian Arambourgia gaudryi from the Eocene of Quercy (France) using CT data and its implications for the phylogeny and paleoecology of basally branching alligatoroids

Davide Conedera,

Yohan Pochat-Cottilloux,

Nicolas Rinder

et al.

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Cited by 4 publications

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Endocranial anatomy and phylogenetic position of the crocodylianEosuchus lericheifrom the late Paleocene of northwestern Europe and potential adaptations for transoceanic dispersal in gavialoids

Burke,

Boerman,

Perrichon

et al. 2024

The Anatomical Record

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Eosuchus lericheiis a gavialoid crocodylian from late Paleocene marine deposits of northwestern Europe, known from a skull and lower jaws, as well as postcrania. Its sister taxon relationship with the approximately contemporaneous speciesEosuchus minorfrom the east coast of the USA has been explained through transoceanic dispersal, indicating a capability for salt excretion that is absent in extant gavialoids. However, there is currently no anatomical evidence to support marine adaptation in extinct gavialoids. Furthermore, the placement ofEosuchuswithin Gavialoidea is labile, with some analyses supporting affinities with the Late Cretaceous to early Paleogene “thoracosaurs.” Here we present novel data on the internal and external anatomy of the skull ofE. lericheithat enables a revised diagnosis, with 6 autapormorphies identified for the genus and 10 features that enable differentiation of the species fromEosuchus minor. Our phylogenetic analyses recoverEosuchusas an early diverging gavialid gavialoid that is not part of the “thoracosaur” group. In addition to thickened semi‐circular canal walls of the endosseous labyrinth and paratympanic sinus reduction, we identify potential osteological correlates for salt glands in the internal surface of the prefrontal and lacrimal bones ofE. lerichei. These salt glands potentially provide anatomical evidence for the capability of transoceanic dispersal withinEosuchus, and we also identify them in the Late Cretaceous “thoracosaur”Portugalosuchus. Given that the earliest diverging and stratigraphically oldest gavialoids either have evidence for a nasal salt gland and/or have been recovered from marine deposits, this suggests the capacity for salt excretion might be ancestral for Gavialoidea. Mapping osteological and geological evidence for marine adaptation onto a phylogeny indicates that there was probably more than one independent loss/reduction in the capacity for salt excretion in gavialoids.

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Endocranial anatomy and phylogenetic position of the crocodylianEosuchus lericheifrom the late Paleocene of northwestern Europe and potential adaptations for transoceanic dispersal in gavialoids

Burke,

Boerman,

Perrichon

et al. 2024

The Anatomical Record

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A review of the non‐semiaquatic adaptations of extinct crocodylomorphs throughout their fossil record

Pochat‐Cottilloux

2024

The Anatomical Record

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Crocodylomorphs constitute a clade of archosaurs that have thrived since the Mesozoic until today and have survived numerous major biological crises. Contrary to historic belief, their semiaquatic extant representatives (crocodylians) are not living fossils, and, during their evolutionary history, crocodylomorphs have evolved to live in a variety of environments. This review aims to summarize the non‐semiaquatic adaptations (i.e., either terrestrial or fully aquatic) of different groups from different periods, highlighting how exactly those different lifestyles are inferred for those animals, with regard to their geographic and temporal distribution and phylogenetic relationships. The ancestral condition for Crocodylomorpha seems to have been a terrestrial lifestyle, linked with several morphological adaptations such as an altirostral skull, long limbs allowing a fully erect posture and a specialized dentition for diets based on land. However, some members of this clade, such as thalattosuchians and dyrosaurids display adaptations for an opposite, aquatic lifestyle, interestingly inferred from the same type of morphological observations. Finally, new techniques for inferring the paleobiology of those extinct animals have been put forward in the last decade, appearing as a complementary approach to traditional morphological descriptions and comparisons. Such is the case of paleoneuroanatomical (CT scan data), histological, and geochemical studies.

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The role of climate on the emergence of giant caimanines (Crocodylia, Alligatoroidea) from the Miocene western Amazonian region

Paiva,

Godoy,

Dunne

et al. 2024

Palaeogeography, Palaeoclimatology, Palaeoecology

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An anatomical reappraisal of the dwarf crocodylian Arambourgia gaudryi from the Eocene of Quercy (France) using CT data and its implications for the phylogeny and paleoecology of basally branching alligatoroids

Cited by 4 publications

References 92 publications

Endocranial anatomy and phylogenetic position of the crocodylianEosuchus lericheifrom the late Paleocene of northwestern Europe and potential adaptations for transoceanic dispersal in gavialoids

Endocranial anatomy and phylogenetic position of the crocodylianEosuchus lericheifrom the late Paleocene of northwestern Europe and potential adaptations for transoceanic dispersal in gavialoids

A review of the non‐semiaquatic adaptations of extinct crocodylomorphs throughout their fossil record

The role of climate on the emergence of giant caimanines (Crocodylia, Alligatoroidea) from the Miocene western Amazonian region

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