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首页> 外文期刊>Journal of Systematic Palaeontology >New dinoflagellate cyst and acritarch taxa from the pliocene and Pleistocene of the eastern North Atlantic (DSDP Site 610)
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New dinoflagellate cyst and acritarch taxa from the pliocene and Pleistocene of the eastern North Atlantic (DSDP Site 610)

机译：北大西洋东部的晚新世和更新世的新鞭毛囊肿和雌蕊类群（DSDP站点610）

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摘要

A palynological study of Pliocene and Pleistocene deposits from DSDP Hole 610A in the eastern North Atlantic has revealed the presence of several new organic-walled dinoflagellate cyst taxa. Impagidinium cantabrigiense sp. nov. first appeared in the latest Pliocene, within an interval characterised by a paucity of new dinoflagellate cyst species. Operculodinium? eirikianum var. crebrum var. nov. is mostly restricted to a narrow interval near the Mammoth Subchron within the Pliocene (Piacenzian Stage) and may be a morphological adaptation to the changing climate at that time. An unusual morphotype of Melitasphaeridium choanophorum (Deflandre & Cookson, 1955) Harland & Hill, 1979 characterised by a perforated cyst wall is also documented. In addition, the stratigraphic utility of smalt acritarchs in the late Cenozoic of the northern North Atlantic region is emphasised and three stratigraphically restricted acritarchs Cymatiosphaera latisepta sp. nov., Lavradosphaera crista gen. et sp. nov. and Lavradosphaera lucifer gen. et sp. nov. are formally described.
机译：来自北大西洋东部DSDP 610A孔的上新世和更新世沉积物的孢粉学研究表明，存在几种新的有机壁二鞭毛囊肿类群。白花假单胞菌十一月最早出现在最新的上新世，其间隔时间以稀有新鞭毛囊肿物种为特征。 per虫？埃里克里亚努姆山碎屑变种十一月在上新世（Piacenzian阶段）内，猛Ma象次近时钟附近的狭窄间隔主要受到限制，并且可能是当时气候变化的形态学适应。还记录了一个不同寻常的形态，即Melitasphaeridium choanophorum（Deflandre＆Cookson，1955）Harland＆Hill，1979，其特征是多孔囊壁。此外，还强调了北大西洋北部北部新生代晚期地层的尖顶动物的地层效用，以及三个受地层限制的尖顶动物Cymatiosphaera latisepta sp。十一月，Lavradosphaera crista gen。等。十一月和Lavradosphaera lucifer gen。等。十一月正式描述。

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