Abstract: The fossil holostean described here was collected from Jurong County, Southern Jiangsu Province, and referred to a new species, Sinolepidotus longidorsalis, of the genus Sinolepidotus. This new species resembles Sinolepidotus chekiangensis in its body form, elongated dorsal fin, small mouth, deep coronoid process of the mandible, and deep scales in the middle portion of the flank and dorsal region of the body. However, it is characterized by longer dorsal fin, large number of rays of dorsal fin, acute snout, lack of pectinations of scales, and thus is distinguished from Sinolepidotus chekiangensis. The genus Sinolepidotus is reviewed and its systematic position within the Order Semionotiformes is uncertain. According to the nature of Sinolepidotus and invertebrate fossils, the age of the fish-bearing beds is considered as Early Cretaceous.