New material of the biomineralizing tubular fossil Sinotubulites from the late Ediacaran Dengying Formation, South China
New material of the biomineralizing tubular fossil Sinotubulites from the late Ediacaran Dengying Formation, South China
复制标题
华南埃迪卡拉晚期灯影组生物矿化管状化石新材料
DOI：
10.1016/j.precamres.2015.02.002
复制
发表时间：
2015-05-01
影响因子：
3.8
通讯作者：
Yuan, Xunlai
中科院分区：
文献类型：
--
作者：
Cai, Yaoping;Xiao, Shuhai;Yuan, Xunlai
中管化石是埃迪卡拉晚期的生物矿化管状化石，可能具有动物亲缘关系。它的特点是毫米到厘米大小和两端开放的多层管。管子由两个形态不同的壁组成：一个多层内壁，装饰性很弱；一个多层外壁，有横向或倾斜的波纹，有时还有纵向隆起。以前发表的大多数中华管虫种被认为是模式种：白马陀螺的异名。三个新种--S.Triangularis n.sp.、五角链霉菌S.Pentacarinalsn.sp.和六角链霉菌S.exagonus n.sp.报道了陕西南部中国南部灯影组晚埃迪卡拉世北湾段的化石。这三个新种与模式种相似，具有嵌套的、多层的内外管壁。然而，它们的多边形横截面和纵向脊线是不同的。白马拓的横截面大致呈圆形，外壁缺乏纵脊，三角刺、五角刺和六角刺的横截面分别为三角形、五角形和六角形，外壁外表面分别有3、5和6个纵脊。这种新材料增加了埃迪卡拉纪晚期生物矿化动物的多样性。三角链球菌、五角链藻和六角链藻的三径管、五径管和六径管在身体对称性上与几个早寒武世的管状化石有一些有趣的相似之处，尽管这些寒武纪的管并不是两端开放的。尽管如此，探索跨越前寒武纪-寒武纪边界的三径、五径和六径管状动物进化连续性的诱人可能性将是有趣的。(C)2015爱思唯尔B.V.保留所有权利。
Sinotubulites is a late Ediacaran biomineralizing tubular fossil with a probable animal affinity. It is characterized by millimeter- to centimeter-sized and multi-layered tubes open at both ends. The tube consists of two morphologically different walls: a multi-layered inner wall with weak ornamentations and a multi-layered outer wall with transverse or oblique corrugations and sometimes longitudinal ridges. The majority of previously published Sinotubulites species are considered as synonymous with the type species: S. baimatuoensis. Three new species-S. triangularis n. sp., S. pentacarinalis n. sp., and S. hexagonus n. sp. are reported from the late Ediacaran Beiwan Member of the Dengying Formation in southern Shaanxi Province, South China. The three new species are similar to the type species in having nested, multilayered inner and outer tube walls. However, they are different in their polygonal cross sections and longitudinal ridges. S. baimatuoensis is more or less circular in cross section and lack longitudinal ridges on the outer tube wall, whereas S. triangularis, S. pentacarinalis, and S. hexagonus are respectively triangular, pentagonal, and hexagonal in cross section with three, five, and six longitudinal ridges on the exterior surface of the outer wall. The new material adds to the diversity of late Ediacaran biomineralizing animals. The triradial, pentaradial, and hexaradial tubes of S. triangularis, S. pentacarinalis, and S. hexagonus share some intriguing similarities in body symmetry with several early Cambrian tubular fossils, although these Cambrian tubes are not open at both ends. Still, it would be interesting to explore the tantalizing possibility of evolutionary continuity of triradial, pentaradial, and hexaradial tubular animals across the Precambrian-Cambrian boundary. (C) 2015 Elsevier B.V. All rights reserved.