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- W2055171745 abstract "The holotype of Atacisaurus crassiproratus Astre, 1931 (Middle Eocene; Issel, France) is herein reinterpreted and attributed to cf. Iberosuchus. The holotype of A. crassiproratus consists of a fragment of a mandible that Astre (1931) assigned to an eusuchian crocodile. However, the combination of characters that we have recognized in this mandible allows to consider it as a member of the Metasuchia clade (sensu Benton & Clark 1988). Furthermore, the specimen from Issel shows a similar morphology and the same combination of character states than those of several specimens from the middle Eocene site of Caenes (Duero basin, Salamanca province, Spain). We consider that both the Issel and Caenes mandibles belong to the same taxon. The mandibles of all these specimens, attributed to cf. Iberosuchus, share with other metasuchians the following combination of apomorphic traits: a dorsal prolongation of the dentary ascending behind the tooth row; the presence of a lateral depression on the dentary; robust splenials; the presence of a big slot-like foramen intramandibularis oralis;; and an anteroposteriorly elongated glenoid fossa of the articular. These specimens are also compared with the Eocene African species Eremosuchus elkoholicus Buffetaut, 1989. The phylogenetic relationships, based on mandibular characters, of cf. Iberosuchus with other taxa previously associated to this genus, such as the Sebecosuchia Simpson 1937 (sensu Gasparini et al. 1991) and the Trematochampsidae Buffetaut, 1974 (sensu Buffetaut, 1986, Buffetaut, 1988, Buffetaut, 1989), as well as with other members of the Metasuchia and Neosuchia clade, are discussed. L'holotype de Atacisaurus crassiproratus Astre, 1931 (Éocène moyen; Issel, département de l'Aude, France) est réinterprété et son rapprochement de cf. Iberosuchus est proposé. L'exemplaire type de Atacisaurus crassiproratus est un fragment de mandibule que Astre (1931) a attribué à un crocodile eusuchien. L'ensemble des caractères relevés sur cette mandibule permet cependant de la considérer comme appartenant au clade Metasuchia (sensu Benton & Clark 1988). Le spécimen d'Issel est morphologiquement comparable et présente la même combinaison d'états de caractères que certains restes de mandibules provenant du gisement de l'Éocène moyen de Caenes (bassin du Duero, Salamanca, Espagne). Nous considérons donc qu'ils appartiennent tous au même taxon. La mandibule de A. crassiproratus partage avec les autres Metasuchia la combinaison suivante d'apomorphies: la présence d'un prolongement dorsal du dentaire s'élevant en arrière de la rangée dentaire, de spléniaux élargis, d'un foramen intramandibularis oralis grand et allongé et d'une fosse glénoïde allongée antéro-postérieurement. Cf. Iberosuchus est aussi comparé à l'espèce africaine de l'Éocène Eremosuchus elkoholicus Buffetaut, 1989. Les relations phylogénétiques de cf. Iberosuchus avec des taxons précédemment associés à Iberosuchus tels que les Sebecosuchia Simpson 1937 (sensu Gasparini et al. 1991), et les Trematochampsidés Buffetaut, 1974 (sensu Buffetaut, 1986, Buffetaut, 1988, Buffetaut, 1989) et avec des crocodiles faisant partie des clades Metasuchia et Neosuchia sont discutées. Se propone una reinterpretación del holotipo de Atacisaurus crassiproratus Astre, 1931 (Eoceno medio;Issel, Departamento de Aude, Francia) y su nueva asignación como cf. Iberosuchus.. El ejemplar tipo de A. crassiproratus está constituido por un fragmento de mandíbula que fue atribuido por Astre (1931) a un cocodrilo eusuquiano. Sin embargo, el conjunto de caracteres que pueden reconocerse sobre esta mandíbula permiten considerarla como perteneciente a un miembro del clado Metasuchia (sensu Benton & Clark, 1988). El ejemplar de Issel es morfológicamente similar y muestra la misma combinación de caracteres que algunos otros ejemplares del yacimiento del Eoceno medio de Caenes (Cuenca del Duero, Salamanca, España). La mandíbula de A. crassiproratus comparte con otros Metasuchia algunos caracteres apomórficos como: la prolongación postero dorsal del dentario elevándose por encima de la serie dentaria, un esplenial robusto, un foramen intramandibularis oralis grande y alargado y la fosa glenoidea del articular alargada antero posteriormente. Se comparan dichos ejemplares con la especie del Eoceno africano Eremosuchus elkoholicus Buffetaut, 1989. Se discuten las relaciones filogenéticas de estos especímenes con otros taxones con los que fue previamente asociado Iberosuchus, como los Sebecosuchia Simpson 1937 (sensu Gasparini et al. 1991) y los Trematochampsidae Buffetaut 1974 (sensu Buffetaut, 1986, Buffetaut, 1988, Buffetaut, 1989), y con otros miembros de los clados Metasuchia y Neosuchia." @default.
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- W2055171745 title "Reinterpretation and new denominationof Atacisaurus crassiproratus (Middle Eocene; Issel, France) as cf. Iberosuchus (Crocodylomorpha, Metasuchia)" @default.
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