The diverse clam shrimp Nestoria-Keratestheria fauna is widely distributed in the Dabeigou Formation in northern Hebei and eastern Inner Mongolia of China. Its important component genus Magumbonia from the Dabeigou Fo...The diverse clam shrimp Nestoria-Keratestheria fauna is widely distributed in the Dabeigou Formation in northern Hebei and eastern Inner Mongolia of China. Its important component genus Magumbonia from the Dabeigou Formation in the Luanping Basin, northern Hebei, China, is revised on the basis of a scanning electron microscope （SEM） examination of the type species M.jingshangensis Wang, 1984, which revealed morphological features not recognized previously. These include coarse reticulation on the umbo and prominent growth lines ornamented with densely spaced, small tubercles and fine lirae.展开更多
Clam shrimps are large bivalved branchiopod crustacean. They first occurred in the Devonian, and flourished during the Mesozoic in Asia. Fossil clam shrimps play an important role in the subdivision and correlation of...Clam shrimps are large bivalved branchiopod crustacean. They first occurred in the Devonian, and flourished during the Mesozoic in Asia. Fossil clam shrimps play an important role in the subdivision and correlation of non-marine fossil-bearing strata. The phosphatized carapaces or carapace external/internal moulds are the main objects for taxonomical studies. The delicate ornament and the ontogenetically developing morphological patterns on the growth bands of carapaces are the main fossil taxonomic criteria. While modern clam shrimp taxonomy is based on soft body morphological features and molecular data, which could not be found in the fossil records. This makes it difficult to discuss the fossil and modern clam shrimp phylogenetic relationship. Nowadays scanning electron microscopes are widely available, and can play an important role in investigating clam shrimp carapace morphology which could be common language to integrate fossil and modern taxonomy.展开更多
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...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。展开更多
基金supported by the Project of China Geological Survey (No.1212010610421)the Major Basic Research Projects of the Ministry of Science and Technology,China (National 973 Project No.2006CB701403)+3 种基金the National Natural Science Foundation of China (No.40572005,40632010,J0630967)JSPS Fellowship (ID No.L09522)State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing (No.073106,20082103) (SKLPS)The SEM micrographs were taken through the courtesy of the LEO 1530 VP facility of SKLPS.
文摘The diverse clam shrimp Nestoria-Keratestheria fauna is widely distributed in the Dabeigou Formation in northern Hebei and eastern Inner Mongolia of China. Its important component genus Magumbonia from the Dabeigou Formation in the Luanping Basin, northern Hebei, China, is revised on the basis of a scanning electron microscope （SEM） examination of the type species M.jingshangensis Wang, 1984, which revealed morphological features not recognized previously. These include coarse reticulation on the umbo and prominent growth lines ornamented with densely spaced, small tubercles and fine lirae.
文摘Clam shrimps are large bivalved branchiopod crustacean. They first occurred in the Devonian, and flourished during the Mesozoic in Asia. Fossil clam shrimps play an important role in the subdivision and correlation of non-marine fossil-bearing strata. The phosphatized carapaces or carapace external/internal moulds are the main objects for taxonomical studies. The delicate ornament and the ontogenetically developing morphological patterns on the growth bands of carapaces are the main fossil taxonomic criteria. While modern clam shrimp taxonomy is based on soft body morphological features and molecular data, which could not be found in the fossil records. This makes it difficult to discuss the fossil and modern clam shrimp phylogenetic relationship. Nowadays scanning electron microscopes are widely available, and can play an important role in investigating clam shrimp carapace morphology which could be common language to integrate fossil and modern taxonomy.
文摘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。
基金Major Basic Research Projects of the Ministry of Science and Technology,China(National 973 Project 2012CB822004)National Natural Science Foundation of China(41172010)Deutsche Forschungsgemeinschaft(Wi725/26)
