气候变化领域集成服务门户(CCPortal): Soft part preservation in hyolithids from the lower Cambrian (Stage 4) Guanshan Biota of South China and its implications

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DOI	10.1016/j.palaeo.2020.110079
	Soft part preservation in hyolithids from the lower Cambrian (Stage 4) Guanshan Biota of South China and its implications
	Liu F.; Skovsted C.B.; Topper T.P.; Zhang Z.
发表日期	2020
ISSN	0031-0182
英文摘要	Hyoliths, known globally from the Cambrian to the Permian are generally recognized as early lophotrochozoan animals of uncertain phylogenetic position. The calcareous exoskeleton of hyolithids, one of the two subgroups of hyoliths, consist of four elements including a conical conch, an external operculum, and a pair of curved enigmatic helens, but their ecology and internal morphology have long been considered controversial. Here we present for the first time, remarkably preserved hyolithids with helens and interior soft tissues from the Guanshan Biota (Cambrian, Stage 4) of Shijiangjun section, Wuding County in eastern Yunnan Province of South China. Preserved soft tissues and organs encompass the digestive tract, muscle scars and connective tissues between the operculum and conch. Three modes of soft part preservation in hyolithids from the Guanshan Biota are described: (1) preservation through pyritization, (2) sediment-infilling of guts, and (3) bacterial biofilm pseudomorphs (expressed as large internal hollow cavities), resulting from endogenous bacterial decay of soft parts. Such differential preservation of hyolith guts indicates different taphonomic modes for the soft parts of Cambrian animals in the Guanshan Biota. The newly collected material yields the oldest preserved guts in hyolithids from Konservat-biotas, and reveals new evidence for reconstructing hyolithid anatomy, such as the articulation mechanism of the opercula and the internal structures in the conch. Comparisons with younger well-preserved hyolithid specimens indicate that the gut anatomy of hyolithids was evolutionarily conservative from the early Cambrian through to at least the Ordovician. © 2020 The Author(s)
英文关键词	Cambrian Series 2; Digestive tracts; Hyolitha; Konservat-Lagerstätten; Taphonomy
语种	英语
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150719
作者单位	State Key Laboratory of Continental Dynamics, Shaanxi Key Laboratory of Early Life and Environments and Department of Geology, Northwest University, Xi'an, 710069, China; Department of Palaeobiology, Swedish Museum of Natural History, Box 50007, Stockholm, SE-104 05, Sweden
推荐引用方式 GB/T 7714	Liu F.,Skovsted C.B.,Topper T.P.,et al. Soft part preservation in hyolithids from the lower Cambrian (Stage 4) Guanshan Biota of South China and its implications[J],2020.
APA	Liu F.,Skovsted C.B.,Topper T.P.,&Zhang Z..(2020).Soft part preservation in hyolithids from the lower Cambrian (Stage 4) Guanshan Biota of South China and its implications.Palaeogeography, Palaeoclimatology, Palaeoecology.
MLA	Liu F.,et al."Soft part preservation in hyolithids from the lower Cambrian (Stage 4) Guanshan Biota of South China and its implications".Palaeogeography, Palaeoclimatology, Palaeoecology (2020).