Tube construction and life mode of the late Ediacaran tubular fossil Gaojiashania cyclus from the Gaojiashan Lagerstatte
Tube construction and life mode of the late Ediacaran tubular fossil Gaojiashania cyclus from the Gaojiashan Lagerstatte
复制标题
高家山Lagerstatte埃迪卡拉晚期管状化石Gaojiashania cyclus的管状结构及生活模式
DOI：
10.1016/j.precamres.2012.09.022
复制
发表时间：
2013-01-01
影响因子：
3.8
通讯作者：
Zhang, Xingliang
中科院分区：
文献类型：
--
作者：
Cai, Yaoping;Hua, Hong;Zhang, Xingliang
高家山化石是一种存在生物学问题的管状化石，仅在中国南部陕西省南部的Ediacaran晚期高家山Lagerstatte中发现。它是一个厘米大小的管，由一系列重复的单元组成。每个单元由刚性环和原本柔性的桶形管壁组成。每根管子的直径都保持不变。刚性环元件的长度通常在1至2 mm的范围内，而铲斗部件的长度在0.5-5 mm时变化更大，并且被横向环圈包围。管状体以自由角度显示弯曲、延伸和收缩，指示铲斗构件的原始柔性。G. cyclus tubes在化石和现代管状生物中都是独一无二的，与已知的埃迪卡拉纪和寒武纪管状化石的结构有着显著的区别。综合形态学、埋藏学和古生态学资料表明，G. cyclus可能表现出一种平卧的底上生活方式，可能利用环状结构作为锚，固定在微生物附着的泥质底质上。保存下来的管道被解释为有机体的原始外观，而不是作为管道居民的生活模式重建。现有证据表明，G。cyclus具有非矿化或弱矿化的管，其系统发生亲合性仍未解决。(c)2012爱思唯尔有限公司版权所有。
Gaojiashania cyclus is a phylogenetically problematic tubular fossil that is only known from the late Ediacaran Gaojiashan Lagerstatte in southern Shaanxi Province, South China. It is a cm-sized tube that consists of a series of repeated units. Each unit consists of a rigid ring and an originally flexible bucket-shaped tube wall. Each tube maintains a constant diameter. The rigid ring elements typically range from 1 to 2 mm in length, whereas the bucket components are more variable at 0.5-5 mm in length and are ornamented with transverse annuli. Tubes display curving, extension, and constriction at free angles, indicating the original flexibility of the bucket components. The construction of G. cyclus tubes is unique in both fossil and modern tubular organisms, and strikingly differs from that the structure of other known Ediacaran and Cambrian tubular fossils. Integrated morphological, taphonomic, and paleoecological data suggest that G. cyclus may have exhibited a procumbent epibenthic life mode, possibly using the ring structures as anchors to microbially bound muddy substrate. The preserved tubes are interpreted as the original exterior of the organism, as opposed to a life-mode reconstruction as a tube-dweller. The currently available evidence suggests that G. cyclus had non-mineralized or weakly mineralized tubes, and its phylogenetic affinity remains unresolved. (c) 2012 Elsevier B.V. All rights reserved.