Les Dyrosauridae (Crocodylia, Mesosuchia) des phosphates de l'Eocène inférieur de Tunisie : Dyrosaurus, Rhabdognatus, Phospliatosaurus

A revision of the crocodilians from the early Eocene (Ypresian) phosphates of southern Tunisia shows that they all belong to the family Dyrosauridae. Dyrosaurus choumowitchi Bergounioux and D. berneti Bergounioux are shown to be junior synonyms of D. phosphaticus (Thomas), while D. variabilis Bergounioux is considered as a nomen dubium. «Rhabdosaurus» acutirostris Bergounioux is referred to the genus Rhabdognathus Swinton. Phosphatosaurus gavialoides Bergounioux is a large dyrosaurid with a massive skull and a crushing dentition ; its cranial anatomy is described in detail. Dyrosaurus phosphaticus was doubtless a fish-eating form, as also possibly Rhabdognathus acutirostris, while Phosphatosaurus gavialoides may have fed on turtles.