EARLY CRETACEOUS CRUSTACEA (OSTRACODA,CONCHOSTRACA) FROM THE SHINE-KHUDUK FORMATION OF SE MONGOLIA
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Abstract:
SummaryIn Summer of 2000, an international research group consisted of Japanese, Mongolian, Chinese and American scientists and led by Dr. M.Matsukawa had carried out a field investigation on dinosaur tracks and strata concerned in SE Mongolia, N and NE China for about two months. Here described and illustrated are some crustacean fossils. They include 9 species in 2 genus of ostracodes, and two species of conchostracans (Yanjiestheria gobiensis Chen sp. nov., Neodiestheria mongolensis Chen sp. nov.). These ostracodes could be called the Cypridea-Lycopterocypris assemblage including C. (Cypridea) actuosa, C.(C.) cf. vitimensis, C. (C.) prognata, C. (Pseudocypridina)globra, C.(P.) ellipselloides, C. (Ulwellia) cf. orbiculatodes, Lycopterocypris cf. circulata, L. liaoxiensis, and L.? semirotunda. These forms appeared in several Cretaceous basins of N and NE China, and especially they are very similar to those from the Jiufotang Formation with the famous late Jehol biota in western Liaoning. The Yanjiestheria and Neodiestheria are two common genera of the Lower Cretaceous of China, SW Japan and southern Korean Penusula. Therefore the Shine-Khuduk Formatrion yielding above-mentioned fossil ostracodes and conchostracans of SE Mongolia should be Early Cretaceous in age.
