Paleobiological study of the litteral ostracod from East Asia

日本的沿岸的介形虫区系与西太平洋的介形虫区系有相当多的共同成分。这表明这些动物群可能在地质学上有来自特提斯海的共同祖先。本研究的目的是详细了解中国东部大陆沿着沿岸的介形类动物群的亲缘关系。由于微区系资料的积累需要大量的时间，因此本报告是在现有资料的基础上进行的。在约260个地点的岩石海岸和海底采集了包括介形虫标本在内的样品（约300个沉积物材料）。沉积物样品通过嵌套的筛子洗涤，介形虫标本在双目显微镜下从干燥的沉积物中挑选出来。通过对山东半岛和辽东半岛的介形虫组合进行定量分析，共鉴定出介形虫83种，隶属于42属，其中山东半岛的介形虫17属，辽东半岛的介形虫27种。在Q型聚类分析的基础上，识别出5个生物相。

It is known that the littoral ostracode fauna of Japan has considerable number of elements in common with those of the west Pacific. This suggests that the faunas may have common ancestors from the Tethyan Sea in the geological past. The aim of this project is especially to understand in detail how the littoral ostracode fauna along the coast of east China continent are related phylogenetically.As it takes much time to accumulate microfaunal data, this report is based on the limited data obtained so far.Fieldwork carried out for 100 days between 3 years, samples including ostracode specimens were collected from sea grass and algae on-the rocky shore and sea bottom at about 260 localities (approximately 300 sediment materials) along the entire coast of the east China continent. Sediment samples were washed through nested sieves, and ostracode specimens were picked out from dry sediment under a binocular microscope. Classification of these ostracode species is still progressing.Ostracode assemblages from coastal zones in the north China were quantitatively analyzed to examine the relationship between environmental factors and species distribution, 83 ostracode species belonging to 42 genera from the Shandong Peninsula and 27species belonging to 17 genera from the Liaodong Peninsula were identified. On the base on Q-mode cluster analysis 5 biofacies were recognized.