Antarctosuchus
Antarctosuchus is an extinct genus of capitosauroid temnospondyl known from the Middle Triassic upper Fremouw Formation in the Transantarctic Mountains of Antarctica. It contains a single species, Antarctosuchus polyodon. Discovery. "Antarctosuchus" was named by Christian A. Sidor, J. Sébastien Steyer and William R. Hammer in 2014 and the type species is "Antarctosuchus polyodon". The generic name refers to Antarctica, where the only known specimen was collected, and "suchus", a common suffix for temnospondyls Latinized from the Greek "souchos", an Egyptian crocodile god. The specific name, "polyodon", is derived from the Greek πολύς ("polús") "much", "many" and ὀδών ("odon"), "tooth , in reference to its unique teeth morphology. Antarctosuchus" is known solely from its holotype, a large and relatively complete skull. It was collected form the upper Fremouw Formation in the central Transantarctic Mountains of Antarctica, dating to the Middle Triassic. To date, "Antarctosuchus polyodon" is the only other endemic temnospondyl species from the formation apart from "Kryostega collinsoni", although indeterminate remains referred to benthosuchids and a cranial fragment assigned to "Parotosuchus sp." have also been collected. Description. As its specific name suggests, "Antarctosuchus polyodon" is distinguished by the possession of numerous, extremely small maxillary, palatine, and ectopterygoid teeth, a dental  pattern that suggests specialization on small prey, possibly invertebrates. Other autapomorphic features of this taxon are a parachoanal tooth row that extends far posterior to the choana and occipital condyles which are set close to the midline. "Antarctosuchus" possesses a relatively flat skull, low occiput and well-developed sensory canals, suggesting an aquatic lifestyle. A phylogenetic analysis places "Antarctosuchus" within Capitosauroidea, a clade of derived Triassic stereospondyls as the sister taxon to "Paracyclotosaurus crookshanki" from the Triassic Denwai Formation of India.