[关键词]
[摘要]
产于贵州关岭三叠系营浮游生活的漂泊海百合类(roveacrinids)是该类化石在我国的首次发现,描述其中2种:Osteocrinus cf.virgatus和Osteocrinus spinosus。Osteocrinus的形态是以萼部为中心、由位于中背骨之上的5块辐板生长出5个一级腕,从5个一级腕的第2个腕骨后再分出10个二级腕,共同构成一个纤巧的辐射对称的身体结构。鉴于辐板外侧中上部的韧带凹口与冠部中轴近于平行,腕与冠部的中轴近于垂直联结,表明Osteoc-rinus的形态与Saccocoma tenella(Goldfuss)雷同,其生活方式应与之类似,为口面向上的浮游生活方式。
[Key word]
[Abstract]
The roveacrinids,which were discovered for the first time in China,are reported in this paper.Their fossils were found on the bedding plane of black micrites of the late Triassic lower Xiaowa Formation in Guanling County,Guizhou.Two species,i.e.,Osteocrinus cf.virgatus Kristan-Tollmann,1970 and Osteocrinus spinosus Kristan-Tollmann,1970,are described.The taphonomy of Osteocrinus showing anoxic environment for its preservation,indicates that Osteocrinus is a pelagic crinoid.It can be concluded with confidence that Osteocrinus and Saccocoma tenella have similar life style because they are similar in morphology.
[中图分类号]
P618.130.2
[基金项目]
中国地质调查局地质调查项目 , 中国科学院南京地质古生所研究所现代古生物学和地层学国家重点实验室基金
