(Table T1) Abundance of silicoflagellates in sediments of ODP Hole 199-1219A

Silicoflagellates ranging from middle Eocene to middle Miocene in age are present in Ocean Drilling Program Hole 1219A. The hole was drilled 250.8 meters below seafloor of which an ~120 m section primarily composed of nannofossil ooze with variable radiolarian and clay content is early Miocene and Oligocene in age, and a 95-m section is Eocene radiolarian and zeolithic clays, radiolarian and diatom oozes, and nannofossil oozes and chalks. A total of 150 samples were studied at a sample interval of one per section. Diversity of silicoflagellates is moderate, and the preservation is good. Abundance is generally low, with many samples barren of silicoflagellates, but 31 species and subspecies were identified. One new species, Naviculopsis trigeminus, is described.

大洋钻探计划（Ocean Drilling Program）1219A钻孔中产出了时代介于中始新世至中中新世的硅鞭藻（Silicoflagellates）。该钻孔钻至海底以下250.8米处，其中约120米的岩心段以颗石藻软泥（nannofossil ooze）为主，伴生不同比例的放射虫与黏土，其时代为早中新世至渐新世；另有95米的岩心段时代为始新世，岩性包括放射虫沸石质黏土、放射虫硅藻软泥、颗石藻软泥及白垩（chalks）。本研究以每岩心段1个的采样间隔，共分析了150件样品。硅鞭藻的多样性中等，保存状况良好；其丰度整体偏低，多数样品不含硅鞭藻，但共鉴定出31个种及亚种。本研究还记述了1个新种——三胞胎双锥藻（Naviculopsis trigeminus）。