Litorosuchus

Litorosuchus is a genus of armored, semiaquatic archosauriform reptile from the Middle Triassic of China, closely related to the morphologically similar Vancleavea.

[1] Asides from the aforementioned characteristics, Litorosuchus can also be differentiated from other archosauriforms by a unique combination of other characters: only two teeth are present on the premaxilla, and are situated close to the front of the bone; the maxillary process, on the back edge of the premaxilla, is relatively long; the nasal process of the maxilla extends behind the back edge of the nostril; there is a large, canine-like (caniniform) tooth on each maxilla (also seen in Vancleavea);[2] the prefrontal bone is T-shaped and extends down to the lacrimal bone, separating the latter from the eye socket; the width of the skull roof between the antorbital fenestrae is very thin, being only one-fifth the width of the skull roof between the eye sockets; a vertical ridge is present on the sides of most of the caudal vertebrae; and the joint between the astragalus and the calcaneum is a simple butt joint (the bones meet in flat surfaces, not ball-and-socket joints).

The rocks in which the specimen was found are located in Fuyuan County, Yunnan, and belong to the Zhuganpo Member of the Ladinian-age Falang Formation.

[1] The genus name is derived from Latin litoralis ("littoral"), in reference to the habitat of this animal, and Greek soukhos ("crocodile").

[4] In addition to various actinopterygian fish, various reptiles are known from this location; they include the terrestrial Macrocnemus as well as the aquatic Lariosaurus, Keichousaurus, Yunguisaurus, Qianxisaurus, Tanystropheus, Anshunsaurus, and Glyphoderma.