The Lower Cambrian Chengjiang Lagerstatte provides a good window to explorethe origin and radiation of early bilaterians. Here we describe a netted sclerite-bearing wormTabelliscolex hexagonus gen. et sp. nov., and te...The Lower Cambrian Chengjiang Lagerstatte provides a good window to explorethe origin and radiation of early bilaterians. Here we describe a netted sclerite-bearing wormTabelliscolex hexagonus gen. et sp. nov., and tentatively assign it to palaeoscolecidans ofpriapulids. The cuticle of the animal is covered with two kinds of platy sclerites which areconstructed by hexagonally arranged tubercles Similar structures of the sclerites can be seen onsome Cambrian palaeoscolecidans and lobopods, so, this new species is critical for understanding therelationships between lobopods and palaeoscolecidans.展开更多
对云南晋宁梅树村剖面下寒武统黑林铺组(原筇竹寺组)玉案山段的蠕形动物化石Sabellidites yunnanensis Luo et Zhang,S.badaowanensis Luo et Zhang的模式标本进行重新研究,通过虫体躯干表皮骨板的排列方式与产于同一剖面相同层位的古蠕...对云南晋宁梅树村剖面下寒武统黑林铺组(原筇竹寺组)玉案山段的蠕形动物化石Sabellidites yunnanensis Luo et Zhang,S.badaowanensis Luo et Zhang的模式标本进行重新研究,通过虫体躯干表皮骨板的排列方式与产于同一剖面相同层位的古蠕虫Mafangscolex sinensis Hu 2005以及Palaeoscolex sinensis Hou et Sun躯干体环上骨板排列方式进行对比,认为前3个种躯干表面骨板的排列方式完全相同,即每一体环均有5横排骨板,但与中华古蠕虫(Palaeoscolex sinensis)每一体环只有4横排大骨板的特征不相吻合。建议采用Mafangscolex yunnanensis作为前3者的属种名称,并以最早发表的Sabellidites yunnanensis Luo et Zhang作为该属的模式种。展开更多
In the recent years,exceptional fossil sites have revealed astonishing details on the anatomy,lifestyles and behaviour of Cambrian animals but surprisingly,very little is known about one of their most vital features,r...In the recent years,exceptional fossil sites have revealed astonishing details on the anatomy,lifestyles and behaviour of Cambrian animals but surprisingly,very little is known about one of their most vital features,reproduction.We describe here in situ eggs(clusters of 3 to 30 oocytes)in the tube-dwelling priapulid worm Paraselkirkia sinica from the Cambrian Stage 3 Xiaoshiba Lagerstätte(ca.514 Ma,South China).These oocytes were accommodated within paired tubular ovaries located in the posterior half of the primary body cavity as in modern meiobenthic priapulid worms,thus indicating that the general organization of female tubular gonads in priapulid worms has remained virtually unchanged for half a billion years.Our findings provide for the first time,key information on the reproductive organs and strategies of early ecdysozoans,a huge animal clade that dominated Cambrian marine ecosystems and accounts for a large part of today’s biodiversity(e.g.arthropods).Moreover,we also emphasize the critical role of ecology on the reproductive strategies and lifestyles of both modern and Cambrian worms.展开更多
基金supported by the Natural Science Foundation of China(NSFC)the Ministry of Science and Technology(CMST)of China
文摘The Lower Cambrian Chengjiang Lagerstatte provides a good window to explorethe origin and radiation of early bilaterians. Here we describe a netted sclerite-bearing wormTabelliscolex hexagonus gen. et sp. nov., and tentatively assign it to palaeoscolecidans ofpriapulids. The cuticle of the animal is covered with two kinds of platy sclerites which areconstructed by hexagonally arranged tubercles Similar structures of the sclerites can be seen onsome Cambrian palaeoscolecidans and lobopods, so, this new species is critical for understanding therelationships between lobopods and palaeoscolecidans.
文摘对云南晋宁梅树村剖面下寒武统黑林铺组(原筇竹寺组)玉案山段的蠕形动物化石Sabellidites yunnanensis Luo et Zhang,S.badaowanensis Luo et Zhang的模式标本进行重新研究,通过虫体躯干表皮骨板的排列方式与产于同一剖面相同层位的古蠕虫Mafangscolex sinensis Hu 2005以及Palaeoscolex sinensis Hou et Sun躯干体环上骨板排列方式进行对比,认为前3个种躯干表面骨板的排列方式完全相同,即每一体环均有5横排骨板,但与中华古蠕虫(Palaeoscolex sinensis)每一体环只有4横排大骨板的特征不相吻合。建议采用Mafangscolex yunnanensis作为前3者的属种名称,并以最早发表的Sabellidites yunnanensis Luo et Zhang作为该属的模式种。
基金This study was supported by the National Natural Science Foundation of China(Grant No.41730318)to X.G.Z.and J.Y.the Innovative Research Fund for Graduate Students of Yunnan University(Grant No.2019228)to X.Y.Y.+1 种基金the ASSEMBLE,PRC(CNRS,France and NSFC,China)PAI(Univ.Lyon 1,Région Auvergne Rhône Alpes)grants to J.V.
文摘In the recent years,exceptional fossil sites have revealed astonishing details on the anatomy,lifestyles and behaviour of Cambrian animals but surprisingly,very little is known about one of their most vital features,reproduction.We describe here in situ eggs(clusters of 3 to 30 oocytes)in the tube-dwelling priapulid worm Paraselkirkia sinica from the Cambrian Stage 3 Xiaoshiba Lagerstätte(ca.514 Ma,South China).These oocytes were accommodated within paired tubular ovaries located in the posterior half of the primary body cavity as in modern meiobenthic priapulid worms,thus indicating that the general organization of female tubular gonads in priapulid worms has remained virtually unchanged for half a billion years.Our findings provide for the first time,key information on the reproductive organs and strategies of early ecdysozoans,a huge animal clade that dominated Cambrian marine ecosystems and accounts for a large part of today’s biodiversity(e.g.arthropods).Moreover,we also emphasize the critical role of ecology on the reproductive strategies and lifestyles of both modern and Cambrian worms.
基金This work was supported by the National Natural Science Foundation of China(Grants Nos.40302004,40432006)Chinese Academy of Sciences(Grant No.KZCX3-SW-141)the Ministry of Scicence and Technology of China(Grant No.200077700).
