A new species of Cloudina from the terminal Ediacaran of Spain
A new species of Cloudina from the terminal Ediacaran of Spain
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DOI：
10.1016/j.precamres.2009.10.010
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发表时间：
2010-01-01
影响因子：
3.8
通讯作者：
Palacios, T.
中科院分区：
文献类型：
--
作者：
Cortijo, I.;Marti Mus, M.;Palacios, T.
埃迪卡拉晚期属Cloudina包括一些最早的生物矿化化石。它由一个由堆叠的漏斗状元素组成的管状结构组成，通常被解释为早期后生动物的外部骨架。虽然在这个属内已经描述了一些种，但它们的特殊性仍然不清楚，它们可能都属于模式种，Cloudina hartmannae germs，1972。这里我们描述了来自西班牙中部的新物种Cloudina carinata。Carinata n.sp.具有独特的形态特征，其特征是外部纵向波峰，这使得管子具有不规则的多边形横截面。漏斗有一个加厚的孔口边缘和一个底部略有收缩的圆形开口。连续的漏斗看起来没有之前描述的云物质那么深的叠瓦状。在所研究的物质中有管状脱节的证据，特别是大量松散的漏斗，表明漏斗是作为独立的元素分泌出来的，而不是与以前的元素融合在一起。然而，在生物体的生命过程中，它们可能会通过壁间无机粘合剂的沉淀而融合在一起。Carinata n.sp.的几个标本展示无性繁殖的证据。(C)2009爱思唯尔B.V.保留所有权利。
The terminal Ediacaran genus Cloudina includes some of the earliest biomineralized fossils. it consists of a tube formed by stacked funnel-shaped elements, and is usually interpreted as the external skeleton of an early metazoan. Although a number of species have been described within this genus, their distinctiveness remains unclear and they may all belong to the type species, Cloudina hartmannae Germs, 1972. Here we describe the new species Cloudina carinata, from central Spain. C. carinata n. sp. has a distinct morphology characterized by external longitudinal crests, which confer on the tube an irregular polygonal cross-section. The funnels have a thickened apertural rim and a basal, slightly constricted circular opening. Successive funnels appear less deeply imbricated than in previously described material of Cloudina. The evidence of tube disarticulation in the material studied, particularly the abundance of loose funnels, indicates that funnels were secreted as independent elements, not fused to the previous ones. However, they could become fused during the life of the organism through the precipitation of inorganic cements between their walls. Several specimens of C. carinata n. sp. show evidence of asexual reproduction. (C) 2009 Elsevier B.V. All rights reserved.