Sedentary habits of anthozoa-like animals in the Chengjiang Lagerst盲tte: Adaptive strategies for Phanerozoic-style soft substrates
详细信息 查看全文
- 作者：Qian-Ping Lei ; Jian Han ; Qiang Ou ; Xiao-Qiao Wan
- 关键词：Sedentary habit ; Anthozoa-like animals ; Soft substrate ; Chengjiang Lagerstä ; tte ; Cambrian
- 刊名：Gondwana Research
- 出版年：April, 2014
- 年：2014
- 卷：25
- 期：3
- 页码：966-974
- 全文大小：3108 K
文摘
Substrates have perpetually played a crucial role in shaping the morphology of animal bodies, particularly the sedentary apparatus of benthic suspension feeders. In-situ preservation of sedentary forms from Cambrian Lagerst盲tten, especially the Lower Cambrian Chengjiang Lagerst盲tte, Yunnan Province, southwestern China, provides a unique opportunity for studying ancient interactions between the benthos and their substrates. The sedentary apparatuses of anthozoa-like animals Xianguangia sinica , Archotuba conoidalis and Archisaccophyllia kunmingensis from the Chengjiang Lagerst盲tte are investigated in their sedimentary context. X. sinica bears a cylindrical, rigid column and a basal, rounded, cuticularized attachment disc that partially attached into the soft muddy substrate; A. kunmingensis has a prominent, flexible pedal-shaped disc that attached directly to the substrate by expanding its disc surface area; whereas A. conoidalis has a unique, posterior-tapering tube and probably might have secreted mucus to firmly attach to the 鈥榮clerotized鈥?substrates. These three sedentary taxa employed different adaptive strategies, i.e., the 鈥榠ceberg鈥? the 鈥榮nowshoe鈥?and one newly defined but later widespread in Phanerozoic period, the 鈥榓nchoring-nail鈥? to cope with the soft substrates. Furthermore, the anchoring-nail mode, sclerite-sticking behavior represented by Archotuba is a Phanerozoic innovative strategy in response to the appearance of pelagic larvae and small shelly fossils, especially to the first widespread biomineralization event at the beginning of the Cambrian, whereas the other two modes have already developed for about 90 Ma from the Ediacaran.