江苏句容中生代晚期中华鳞齿鱼属(Sinolepidotus)一新种,兼论该属的系统位置

记述了在江苏句容发现的中华鳞齿鱼属(Sinolepidotus)一新种——长背鳍中华鳞齿鱼(Sinolepidotus longidorsalis sp.nov)。新种的一般形态特征如身体高纺锤形，背鳍长，臀鳍离尾鳍近，头骨外部骨片的形状及排列格局，口裂小，下颌骨有较高的冠状突，口缘牙齿高而尖，体侧中部和背区的一些鳞片高显著大于宽等，与浙江早白垩世的浙江中华鳞齿鱼(Sinolepidotus chekiangensis)很相似。但新种具有背鳍较长，背鳍鳍条数目较多，吻突尖，及鳞片后缘梳状齿不发育等特征区别于浙江中华鳞齿鱼。此外，评论了中华鳞齿鱼属的系统位置，认为它的形态特征与Paralepidotus很相似，对它原列入半椎鱼科提出疑问。根据长背鳍中华鳞齿鱼的性质并参考有关地质古生物资料，将含鱼层杨冲组的时代定为早白垩世。

A NEW SPECIES OF SINOLEPIDOTUS FROM LATE MESOZOIC OF SOU-THERN JIANGSU, WITH COMMENTS ON THE GENUS SINOLEPIDOTUS

The fossil holostean described here was collected from Jurong County ,Southern Jiang su Province,and referred to a new species,Sinolepidotus longidorsalis,of thegenus Sinolepidotus. This new species resembles Sinolepidotus chekiangensis in its body form ,elongateddor salfin ,small mouth ,deep coronoid process of the mandible,and deep scales in the middle portion of the flank and dorsalregion of the body.However,it is characterized by longer dorsalf in ,large number of rays of dorsalf in ,acutesnout,lackofpectinations 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.