英国早石炭世大网叶肢介科一新属

描述了采自英国伯维克郡下石炭统下泥石群（杜内附）叶肢介一新属－ｌｏｎｇｅｓｈｅｒｉａｇｅｎ．ｎｏｖ．据壳瓣生产带上发育大网状纹饰构造。归属于Ｌｏｘｏｍｅｇａｇｌｙｐｔｉｄａｅ科，从而使该科的地质历程从晚二叠世，一直追溯到早石炭世早期。讨论了新属与该科其它属之间的形态特征联系。认为化石为原理藏，含叶肢介崦层属非海相沉积。

A NEW CONCHOSTRACAN GENUS(LOXOMEGAGLYPTIDAE)FROM LOWER CARBONIFEROUS OF BRITAIN

The family Loxomegaglyptidae is characterized by an ornament of moderate to large polygonal reticulations (with mesh 0. 02--0. 2 in diameter) on the broad and flattened growth bands of the valve. The earliest representative of the family is Tshuvashium from the Upper Permian Tatalian stage of Tshuvash, Russia (Novojilov. 1958). More forms of the family are found in the Triassic, such as Loxomegaglypta (Novojilov, 1958), Diaplexa (Novojilov, 1954), Anyuanestheria and Shipingia (Zhang Wentang et al., 1976). Several genera belonging to this family from the Jurassic and Cretaceous were named Nestoria (Krasinetz, 1962), Paleoleptestheria (Novojilov, 1954) and Pseudoasmussia (Novojilov, 1954 ). The genus Paraleptestheria from the Eocene of China is so far known as the youngest member of the family (Chen Pei n, 1975: Chen Pei n and Shen Yanbin, 1 981). All the genera mentioned above are distributed in Eurasia.