Atacisaurus

Atacisaurus; Temporal range: Middle Eocene, Bartonian PreꞒ Ꞓ O S D C P T J K Pg N ↓
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Clade:	Archosauria
Order:	Crocodilia
Superfamily:	Gavialoidea
Family:	Gavialidae
Genus:	†Atacisaurus; Astre, 1931
Species:	†A. glareae
Binomial name
	†Atacisaurus glareae; Astre, 1931

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]

Discovery and naming

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

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

^ ^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.
^ ^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.
^ ^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.
^ ^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.
^ 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.
^ Romer, A. S. (1956). Osteology of Reptiles. Chicago: University of Chicago Press
^ Kuhn, O. (1968) Die vorzeitlichen Krokodile. Munich: Oeben, Krailling bei München.
^ 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.
^ 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.
^ 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.
^ 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.

[:0-1] 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.

[Ortega96-2] 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.

[:1-3] Astre, G. (1931). "Les crocodiliens fossiles des terrains tertiaires sous pyrénéens". Bulletin de la Société d'Histoire naturelle de Toulouse. 61: 25–71.

[:2-4] 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.

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