Atacisaurus is an extinct dubious genus of gavialoid crocodylian. Fossils have been found in the Grès de Carcassonne Member of the Sables du Castrais Formation in Laure-Minervois, France that date back to the Middle Eocene.[1]

Atacisaurus
Temporal range: Middle Eocene, Bartonian
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Archosauromorpha
Clade: Archosauriformes
Order: Crocodilia
Family: Gavialidae
Genus: Atacisaurus
Astre, 1931
Species:
A. glareae
Binomial name
Atacisaurus glareae
Astre, 1931

Discovery and naming

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The holotype, discovered in 1919 by M. Finestres in Laure-Minervois and previously housed at the Société d'Etudes Scientifiques de l'Aude,[1] is an anterior portion of a mandible which is now lost,[1] and MHNT.PAL.2012.0.49, a partial skull from a different specimen is also known, which was donated to the History Museum of Toulouse in 1873 by Henri de Sévérac;[2] MHNT.PAL.2012.0.49 has since been partially prepared at sometime between 1931 and 17 April 2016.[1]

The type species, A. glareae, was named and described by Gaston Astre in 1931.[3] A snout fragment from the History Museum of Tolouse was also described by Astre (1931),[3] but can not be identified further than cf. Atacisaurus.[1]

A second nominal species of this genus, Atacisaurus crassiproratus, was reclassified as a sebecosuchian in the 1990s, listed as cf. Iberosuchus by Ortega et al. (1996)[2] before being recognized as distinct from Iberosuchus by Martin et al. (2023) and renamed Dentaneosuchus.[4]

Classification

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Atacisaurus glareae has been considered synonymous with Pristichampsus rollinatii,[5] Tomistoma,[6][7] Crocodylus intermedius[8] and Kentisuchus spenceri.[9]

Although currently classified within Gavialidae,[4] Atacisaurus has been suggested to have tentatively belonged within Tomistominae due to its resemblance to Megadontosuchus.[10][11]

References

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  1. ^ a b c d e Jouve, Stéphane (2016). "A new basal tomistomine (Crocodylia, Crocodyloidea) from Issel (Middle Eocene; France): palaeobiogeography of basal tomistomines and palaeogeographic consequences: A New Basal Tomistomine from France". Zoological Journal of the Linnean Society. 177 (1): 165–182. doi:10.1111/zoj.12357.
  2. ^ a b Ortega, F.; Buscaloni, A.D; Gasaparini, Z. (1996). "Reinterpretation and new denomination of Atacisaurus crassiproratus (Middle Eocene; Issel, France) as cf. Iberosuchus (Crocodylomorpha, Metasuchia)". Geobios. 29 (3): 353–364. Bibcode:1996Geobi..29..353O. doi:10.1016/S0016-6995(96)80037-4.
  3. ^ a b Astre, G. (1931). "Les crocodiliens fossiles des terrains tertiaires sous pyrénéens". Bulletin de la Société d'Histoire naturelle de Toulouse. 61: 25–71.
  4. ^ a b Martin, J. E.; Pochat-Cottilloux, Y.; Laurent, Y.; Perrier, V.; Robert, E.; Antoine, P.-O. (2023). "Anatomy and phylogeny of an exceptionally large sebecid (Crocodylomorpha) from the middle Eocene of southern France". Journal of Vertebrate Paleontology. 42 (4). e2193828. doi:10.1080/02724634.2023.2193828. S2CID 258361595.
  5. ^ Rossmann, Torsten (1998-11-10). "2. Taxonomical revision of the family Pristichampsidae EFIMOV (Crocodilia: Eusuchia)". Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen. 210 (1): 85–128. doi:10.1127/njgpa/210/1998/85. ISSN 0077-7749.
  6. ^ Romer, A. S. (1956). Osteology of Reptiles. Chicago: University of Chicago Press
  7. ^ Kuhn, O. (1968) Die vorzeitlichen Krokodile. Munich: Oeben, Krailling bei München.
  8. ^ Berg, D. E. (1966) Die Krokodile, insbesondere Asiatosuchus und aff. Sebecus?, aus dem Eozän von Messel bei Darmstadt/Hessen. Abhandlungen des Hessischen Landesamtes für Bodenforschung 52:1-105.
  9. ^ Jouve, S. (2004). Etude des Crocodyliformes fini Crétacé-Paléogène du Bassin des Oulad Abdoun (Maroc) et comparaison avec les faunes africaines contemporaines: systématique, phylogénie et paléobiogéographie. Unpublished Ph.D. Dissertation. Paris: Muséum National d'Histoire Naturelle, 651 pp.
  10. ^ Vasse, D. (1992).Les crocodiles de l'Aude: aperçu du matériel connu et présentation de quelques nouvelles pièces. Bulletin de la Société d'Etudes Scientifiques de l'Aude. 92: 37–41.
  11. ^ Brochu, C. A. (2013). Phylogenetic relationships of Palaeogene ziphodont eusuchians and the status of Pristichampsus Gervais, 1853. Earth and Environmental Science Transactions of the Royal Society of Edinburgh 103: 521–550.