Discoveries of new Longfengshaniaceae from the uppermost Ediacaran in eastern Yunnan, South China and the significance |
| |
| Authors: | Tang Feng Song Xueliang Yin Chongyu Liu Pengju S M Awramik Wang Ziqiang and Gao Linzhi |
| |
| Institution: | (1) Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China;(2) Institute of Geosciences of Yunnan Province, Kunming, 650051, China;(3) Department of Geological Sciences, University of California, Santa Barbara, CA 93106, USA;(4) School of Earth Sciences and Resources, China University of Geosciences, Beijing, 100083, China |
| |
| Abstract: | A morphologically more diverse assemblage of Longfengshaniaceae has been found in the uppermost Ediacaran (Sinian) Jiucheng
Member, Yuhucun Formation at Jinning and Jiangchuan, eastern Yunnan, South China. A majority of them are different from the
Longfengshania found in the Neoproterozoic Changlongshan Formation, Yanshan Mountain area, North China and the Little Dal Group, North America.
They are mainly characterized by a more varied, often thallus-like appearance with no branches, such as oval, pyriform, spindle,
shovel, heart, ribbon and balloon shapes, and more sturdy stalk-like projection (stipe) with a smooth connection on the basal
part of the thallus. In addition, they appear to have a remarkable attaching organ of lanceolate, shuttle-like or short stem-like
structure at the base of the stipe. Six distinct morphological taxa are recognized, including one new genus, two new species
and three conformis species. The characteristics of the family and the genus Longfengshania are further discussed in this paper. The new discoveries of these carbonaceous macrofossils identified as Longfengshaniaceae
algae on the basis of the diagnostic forms and anastomosis patterns of their thalli and stipes demonstrate that an important
evolutionary radiation of metaphytes took place in the last Ediacaran stage. The flourishing of the benthonic thallophytes
attached to the substrate from eastern Yunnan and considered to be photosynthetic alga probably provided continuous nutritional
habitats for the explosion and diversification of the Early Cambrian “Chengjiang biota”.
Translated from Acta Geologica Sinica, 2006, 80(11): 1643–1649 译自: 地质学报] |
| |
| Keywords: | eastern Yunnan Ediacaran Jiucheng Member Longfengshaniaceae |
| 本文献已被 万方数据 SpringerLink 等数据库收录！ |
|
