中文摘要：

对琉球群岛东侧的菲律宾海北部海区（27.0°-30.0°N,129.5°-135.5°E）水深1666m至6616m的123个表层沉积物样品进行了定量微体古生物学研究。仅在38个样品中发现介形类,主要分布在4000m以浅水深区。初步鉴定有21属35种,其中Krithe在样品中的出现率和丰度最高,其次常见的还有Poseidonamicus,Henryhow-ella asperi ma,Cytheropteron,Pennyella,Aversovalva subformis,Pseudobosquetina mucronalatum和Legiti mo-cythere acanthoderma。建立了3个新种Aversovalva paraformisZhao sp.nov.,Cytheropteron houaeZhao sp.nov.和Pennyella microreticulataZhao sp.nov.。

英文摘要：

A micropaleontological analysis has been made on 123 samples taken from surface sediments of the northern Philippine Sea,NW Pacific（27.0°—30.0°N,129.5°—135.5°E,water depth from 1 666 m to 6 616 m）.A total of 35 species belonging to 21 genera has been found from 38 samples which were taken mainly from water depths shallower than 4 000 m.The ostracod fauna is dominated by cosmopolitan deep-sea species,of which Krithe is the most abundant.The other main components are Poseidonamicus,Henryhowella asperima,Cytheropteron,Pennyella,Aversovalva subformis,Pseudobosquetina mucronalatum and Legitimocythere acanthoderma.Three new species are described：Aversovalva paraformosa,Cytheropteron houae Zhao and Pennyella microreticulata.