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伊克昭弓鳍鱼在华南的发现

1980年 第18卷 第2期: 89~93

发表日期:2009-04-28李志恒来源:放大 缩小

编辑:张弥曼 张宏

摘要:A new species of IkechaoamiaI. meridionalis is described from the Upper Jurassic of Zhejiang Province, south-eastern China. The only other species of the genus—I. orientalis Liu was known from Inner Mongolia in association with Lycoptera fauna.
    The new species is on the whole in accordance with I. orientalis. It differs from the latter in the number of vertebrae and fin rays only. Besides that, an articulated epaxial fin-ray is present on the dorsal border of the caudal fin of the I. meridionalis specimens V5805.1 and V5805.2 but is absent in the well preserved specimen V2519.1 of I. orientalis. However, because of the scarcity of specimens, it is difficult to judge whether this is due to individual variation or specific difference.
    According to our observation, most of the scales of Ikechaoamia (I. orientalis included) are rhombic. But some of the lateral line scales are enlarged and irregular in shape. The scales near the ventral border are rounded, with numerous radial lines directed forward.
    At first glance Ikechaoamia is quite similar to European Jurassic Urocbes in body proportion, jaw and opercular bones, long dorsal fin, rounded caudal fin, epaxial fin-rays, one-to-one hypural/fin-ray relationship, concentric and radial lines in scales, etc. But Ikechaoamia can be easily distinguished from the latter by the presence of fused parietals and subdivided supratemporals.

卷期:18卷 02期

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