中国科学院南京地质古生物研究所机构知识库

Early Cretaceous clam shrimp specimens of Yanjiestheria were first discovered in the Lishugou Formation at Wudaohezi in northwestern Huanren Manchu Autonomous County of eastern Liaoning in 1930, which played an important role for understanding of the terrestrial palaeoenvironment in East Asia. In 2019, a new geological investigation has reported the first discovery of the clam shrimp Eosestheria (a common component of the Jehol Biota) from the Lishugou Formation at Xiaowenzhigou in northwestern Huanren in 2019. A detailed taxonomic study of these newly collected clam shrimp specimens revealed that their growth bands are ornamented with very fine reticulation (mesh diameter about 20-30 mu m) in the dorsal and antero-ventral parts of the carapace. Densely spaced radial lirae are also observed in the ventral and postero-ventral parts of the carapace (about 40-50 lirae within a width of 1 mm). Through comparison with the type specimen from Wudaohezi, northwestern Huanren, the newly collected clam shrimp specimens are not an eosestheriid, but are conspecific with Yanjiestheria huanjenensis (Novozhilov, 1954). (C) 2021 Elsevier Ltd. All rights reserved.