Distribution of dinoflagellate cycst at ODP Site 123-765 (Table 1)

Site 765 contains a sequence of tropical, middle Miocene to Holocene dinoflagellate cysts. These diverse assemblages are characterized by abundant Polysphaeridium zoharyi and Spiniferites bulloideus. Abundances of Impagidinium spp. and Nematosphaeridium spp. reflect the shelf-to-slope origin of the assemblages. One new genus, Blysmatodinium, and two new species, Nematosphaeridium (?) wrennii sp. nov. and Blysmatodinium argoi, are described.

765站位拥有一套形成于热带环境、时代跨度为中中新世至全新世的沟鞭藻囊孢（dinoflagellate cysts）序列。该化石组合多样性丰富，以大量产出佐哈里多球藻（Polysphaeridium zoharyi）与球刺甲藻（Spiniferites bulloideus）为主要特征。隐沟藻属（Impagidinium）未定种与线囊藻属（Nematosphaeridium）未定种的丰度特征，反映了该组合的陆架-斜坡沉积成因。本次研究记述了1个新属——布利斯玛藻属（Blysmatodinium），以及2个新种：分类地位存疑的雷恩尼线囊藻（Nematosphaeridium (?) wrennii sp. nov.）与阿尔戈伊布利斯玛藻（Blysmatodinium argoi）。