西班牙加泰罗尼亚 CERDANYA地区晚中新世轮藻植物 LYCHNOTH AMNUS BARBATUS的分类学与古生态学意义(英文)  

LYCHNOTHAMNUS BARBATUS (CHAROPHYTES) FROM THE UPPER MIOCENE OF LA CERDANYA (CATALONIA, SPAIN):TAXONOMIC AND PALAEOECOLOGICAL IMPLICATIONS

作　　者：Ingeborg SOULIE-MARSCHE Carles MARTIN-CLOSAS 

机构地区：[1]蒙彼利埃第二大学生物演化研究所古生物实验室,法国蒙彼利埃34095 [2]巴塞罗那大学地质系古生物学教研室,西班牙巴塞罗那08028

出　　处：《微体古生物学报》2003年第2期156-165,共10页Acta Micropalaeontologica Sinica

摘　　要：轮藻纲植物 Lychnothamnus barbatus的化石在西班牙加泰罗尼亚地区比利牛斯山脉东部 Cerdanya盆地上中新统 (Turolian阶 )发现。通过与现生 L.barbatus的比较研究 ,发现两者在藏卵器大小方面存在较大差别 ,据此建立新亚种 L ychnothamnus barbatus ssp.megalicarpus subsp.nov.,其藏卵器的各项特征均与器官属 Rhabdochara(Madler) Grambast一致 ,证实两者为同物异名。Lychnothamnus barbatus在盆地上部湖相沉积层中的大量存在 ,表明湖盆演化史后期发生过营养状况由富营养化向贫营养化转变的现象。The present paper reports on the find of fossil representatives of the Characeae Lychnothamnus barbatus from the Upper Miocene (Turolian) of La Cerdanya basin (Eastern Pyrenees, Catalonia, Spain). In comparison with the gyrogonites of extant L. barbatus, the material displays significant differences in size giving rise to establish it as Lychnothamnus barbatus ssp. megalicarpus subsp. nov. The gyrogonites show all the diagnostic features of the former organ-genus Rhabdochara (Mdler) Grambast and confirm the synonymy of both genera. The presence of large populations of Lychnothamnus barbatus in the upper lacustrine layers of La Cerdanya basin indicates a trophic shift, from eutrophy to oligotrophy, in the late history of the lake.

关 键 词：轮藻门 轮藻纲 分类学 古生态学 古湖泊学 中新统 西班牙 化石 

分 类 号：Q914.82[天文地球—古生物学与地层学]