论文部分内容阅读
中国唐古拉地区侏罗纪牡蛎类(双壳类软体动物)呈3种地理格局分布:(1)特提斯:Liostrea birmanica, Eligmus rollandi;(2)欧州西部和特提斯北缘:Gryphaea(Bilobissa)bilobata;(3)全球:Actinostreon gregareum,Nanogyra nana.但这些牡蛎类均限于南、北纬60°之间.Actinostreon gregareum 最早诞生于南美智利北部辛涅缪尔期,托阿尔期进入东非肯尼亚和马达加斯加.但是,智利、肯尼亚和马达加斯加之间的大陆边缘迄今没有可靠的辛涅缪尔期-托阿尔期的A.gregareum发现.这样的分布格局表明:(1)侏罗纪时,全球的海、洋互相沟通;(2)特提斯和欧洲西部陆表海中确实繁衍着一些地方性物种;(3)这些牡蛎的分布受着纬度和生物的生态控制:(4)A.gregareum经历了由东向西横渡太平洋的扩散过程.
(1) Tethys: Liostrea birmanica, Eligmus rollandi; (2) The western edge of Europe and the northern edge of Tethys: Gryphaea (Bilobissa ) bilobata (3) Globally: Actinostreon gregareum, Nanogyra nana, but these oysters are confined to the south and latitude 60 ° .Actinostreon gregareum was first born in Sinanmuir in the north of Chile, South America, Togo, Kenya and Madagascar entered East Africa However, to date, no credible Singel-Tropic A.regregum discovery has been found on the continental margins between Chile, Kenya and Madagascar, indicating that: (1) during the Jurassic period, the global oceans and oceans (2) Tethys and some of the western terrestrial surfaces in the western Europe have indeed reproduced some endemic species; (3) the distribution of these oysters is controlled by latitude and biological ecology: (4) A. gregareum has experienced a series of events from east to west Transatlantic diffusion process.