榆社鲴 (Xenocypris Yushensis)属于硬骨鱼类里的鲤形目的鱼类。化石标本长达 182 mm。鱼的外形较侧扁 ,胸鳍长位置低 ,腹鳍小 ,它与背鳍在鱼的背、腹两侧的起点几乎相对。臀鳍中等大小 ,尾鳍分叉深。鳞片为圆鳞。侧线在胸鳍和腹鳍之间明显向下弯曲。化石发现于山西武乡榆社一 Xenocypris Yushensis is a carp-shaped fish belonging to bony fish. Fossils specimens up to 182 mm. The shape of the fish is more flat side, pectoral fins long position is low, the pelvic fins small, it with the dorsal fin in the back of the fish, almost opposite the starting point on both sides of the abdomen. Anal fin medium size, caudal fin bifurcation. Scale for the round scales. Lateral line between the pectoral and pelvic fins significantly downward bend. Fossil found in Shanxi Wuxiu Yushe one