Abstract: A crocodyliform specimen collected from the Late Jurassic Shangshaximiao Formation, Zigong, Sichuan Basin, China comprises a nearly complete skull, mandibles, most vertebrae, partial pectoral and pelvic girdles, most forelimbs and osteoderms. It represents a new species of Hsisosuchus, H. chowi sp. nov. Diagnostic features of the new species include a shallow longitudinal depression between nasals; a ridge along orbital margm of frontal; a faint ridge along suture between frontals; a distinct ridge along medial margin of supratemporal fossa; an anteromedian process of parietal wedging between posterior processes of frontals; ventral margin of jugal distinctly waved in lateral view; postorbital having an angular anterolateral comer; posterolateral process of squamosal extraordinarily elongated and extending outwards, downwards and backwards, leading to lateral margin of squamosal distinctly arched medially; exoccipital not contacting its opposite on occipital condyle; a ventral median ridge of pterygoid originated from main body of pterygoid; and choana positioned anteriorly. The discovery of H. chowi increases not only the distribution but also the understanding of the specialized hsisosuchids.

摘要： 记述了四川省自贡市汇东新区自贡市乳品厂发现的西蜀鳄一新种——周氏西蜀鳄(Hsisosuchus chowi sp．nov．)。新种区别于西蜀鳄已知种的特征是：鼻骨后部沿缝合线有一浅的纵凹，额骨的眶缘向上凸起成嵴，沿额骨缝合线也隆起成一微弱的纵嵴，上颞窝的内侧缘向上凸起呈明显的嵴，顶骨具一前中突，侧视颧骨腹缘呈明显的波曲状，眶后骨前侧角约90°，鳞骨后侧突特别拉长，向侧下后方伸展，使鳞骨侧缘明显向内侧弓曲，左右外枕骨的枕髁部分不相接，翼骨的腹中嵴源于翼骨主体部分，内鼻孔位置比较靠前。此外，齿骨外面和