【摘要】 通过扫描电镜重新研究产自冀北丰宁满族自治县花吉营下白垩统西瓜园组的花吉营丰宁叶肢介(Fengninggrapta huajiyingensis)的正型标本。电镜照相揭示以前光学照相无法分辨的重要分类特征,其中包括:1)胎壳附近窄生长带上的小到中网装饰和密而细的线脊夹小网装饰;2)胎壳附近生长线上的小网装饰;3)靠腹边缘生长带粗壮线脊下端向下接近生长线时膨胀变成三角形"滨生长线瘤"。从而修定丰宁叶肢介的特征描述。更多还原

【Abstract】 Re-examination of the holotype specimen of the clam shrimp type species Fengninggrapta huajiyingensis using a scanning electron microscope(SEM)has revealed details of carapace features of important taxonomic value,which has not been described hitherto.The new characteristics include:1)small-to mediumreticulation and dense and fine radial lirae with intercalated fine reticulations on narrow growth bands near the umbo;2)growth lines near the umbo ornamented by fine reticulations;3)triangular tubercles occur at the lower ends of the robust radial lirae on growth bands near the ventral margin.Consequently,we have revised the diagnosis of Fengninggrapta.更多还原