Form and function of the pelvic girdle of Thalattosuchia and Dyrosauridae (Crocodyliformes) Author Scavezzoni, Isaure Universite de Liège, Evolution and Diversity Dynamics Lab, All. du Six Août 14, 4000 Liège (Belgique) isaure. scavezzoni @ gmail. com v. fischer @ uliege. be isaure.scavezzoni@gmail.com Author Fischer, Valentin Universite de Liège, Evolution and Diversity Dynamics Lab, All. du Six Août 14, 4000 Liège (Belgique) isaure. scavezzoni @ gmail. com v. fischer @ uliege. be v.fischer@uliege.be Author Johnson, Michela M. Department of Palaeontology, Staatliches Museum für Naturkunde Stuttgart, Museum am LÖwentor, Rosenstein 1, 70191 Stuttgart (Germany) michela. johnson @ smns-bw. de michela.johnson@smns-bw.de Author Jouve, Stéphane Sorbonne Universite, BUPMC - Pôle Collections, Tour Zamansky, 15 étage, bureau 1513, 4 place Jussieu, 75252 Paris Cedex 05 (France) stephane. jouve @ sorbonne-universite. fr stephane.jouve@sorbonne-universite.fr text Geodiversitas 2024 2024-05-02 46 6 135 326 https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/g2024v46a6.pdf journal article 10.5252/geodiversitas2024v46a6 1638-9395 11106598 urn:lsid:zoobank.org:pub:6ACF6A79-9149-4781-808D-478668673EB6 PLAGIOPHTHALMOSUCHUS GRACILIROSTRIS ( WESTPHAL , 1961 ) For measurements, see Tables 7-9 . Ilium The ilium of Plagiophthalmosuchus gracilirostris ( Westphal, 1961 ) ( Fig. 36 ) bears the typical postacetabular process of teleosauroids contrasting with the metriorhynchoids iliac morphology (e.g.‘ Metriorhynchus ’ brachyrhynchus NHMUK PV R 4763, Thalattosuchus superciliosus , Geosaurus giganteus , etc.). The ilium of Plagiophthalmosuchus gracilirostris is not complete, but appears to possess a rather slender postacetabular process, in the way of Platysuchus multiscrobiculatus . Indeed, the junction between the ventral margin of the postacetabular process and the posterior margin of the ilium seems to form an angle closer to 90° than to an obtuse angle like seen in other teleosauroids (e.g. Lemmysuchus obtusidens , Charitomenosuchus leedsi , Neosteneosaurus edwardsi , etc.). The exact shape of the extremity of the postacetabular process of Plagiophthalmosuchus gracilirostris is unclear, but was presumably elliptic as in other teleosauroids. The dorsal margin of the ilium of Plagiophthalmosuchus gracilirostris , which corresponds to the iliac crest, appears to have been relatively straight or slightly convex as in Lemmysuchus obtusidens , Charitomenosuchus leedsi , and Neosteneosaurus edwardsi . The junction between the iliac crest and the base of the preacetabular process is partially broken but was potentially slightly concave as in other teleosauroids. Likewise, the preacetabular process of Plagiophthalmosuchus gracilirostris is not preserved but presumably presented the shape of a hook. The surface underneath the base of the preacetabular process, corresponding to the anterior margin of the ilium, is straight as in Lemmysuchus obtusidens , Platysuchus multiscrobiculatus and Neosteneosaurus edwardsi contra Charitomenosuchus leedsi .