江西晚三叠世安源叶肢介属重要分类学特征的发现  

Discovery of important taxonomic characters of the type species of the Late Triassic clam shrimp Anyuanestheria (Crustacea: Spinicaudata) from Jiangxi

作　　者：李罡[1] LI Gang(State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008,China)

机构地区：[1]现代古生物学和地层学国家重点实验室,中国科学院南京地质古生物研究所,南京210008

出　　处：《古生物学报》2023年第3期390-397,共8页Acta Palaeontologica Sinica

基　　金：中国科学院战略性先导科技专项(B类)(XDB26000000);国家自然科学基金(41972007,41572006,42288201);国际地球科学计划IGCP 679项目联合资助。

摘　　要：通过扫描电镜重新研究产自江西省萍乡市安源镇三湾上三叠统安源群的近方形安源叶肢介(Anyuanestheria subquadrata Zhang and Chen in Zhang et al., 1976)的模式标本。电镜照相揭示了光学照相无法分辨的重要分类学新特征,其中包括壳瓣背部生长带上的多边形中–大网装饰,以及腹部生长带上的两种装饰类型:每条生长带上部为稀疏纤细的线脊装饰,每条生长带下部中–大网装饰装饰。网状装饰的特征是网壁纤细,网底平浅,印在外膜上表现为彼此濒临的多边形平台。基于以上观察,本文重新修订了安源叶肢介属壳面装饰特征。Re-examination of the type specimens of the clam shrimp type species Anyuanestheria subquadrata Zhang and Chen in Zhang et al.,1976 using a scanning electron microscope(SEM)has revealed details of carapace characters that are of important taxonomic value.These characters have hitherto never been documented.The new characters include medium to large polygonal reticulations on growth bands on the dorsal part of the carapace.Two types of ornaments are present on the growth bands of the ventral and posterior parts of the carapace:fine and widely spaced radial lirae on the upper part and medium to large reticulations on the lower part of each growth band.The walls of the polygonal reticulations are thin with shallow depressions,resulting in flat polygonal protrusions on the external mould.This ornamentation pattern is different from the original description.Based on these observations,the diagnosis of Anyuanestheria is emended.

关 键 词：化石叶肢介 安源叶肢介属 分类学 上三叠统 中国 

分 类 号：Q911.2[天文地球—古生物学与地层学]