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Proc Biol Sci. 2018 Apr 11;285(1876). pii: 20180051. doi: 10.1098/rspb.2018.0051.

Microbial decay analysis challenges interpretation of putative organ systems in Cambrian fuxianhuiids.

Author information

1
Early Life Institute, Shaanxi Key Laboratory of Early Life and Environments, The Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710069, People's Republic of China liujianni@126.com.
2
Department of Earth Science, Freie Universität Berlin, 12249, Berlin, Germany.
3
Museum für Naturkunde, Leibniz Institute for Research on Evolution and Biodiversity at the Humboldt University Berlin, 10115 Berlin, Germany.
4
Early Life Institute, Shaanxi Key Laboratory of Early Life and Environments, The Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710069, People's Republic of China.
5
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, People's Republic of China.

Abstract

The Chengjiang fossil Lagerstätte (Cambrian Stage 3) from Yunnan, southern China is renowned for its soft-tissue preservation. Accordingly structures in fuxianhuiids, radiodontans and great appendage arthropods have been interpreted as the nervous and cardiovascular systems, including brains, hearts and blood vessels. That such delicate organ systems survive the fossilization process seems remarkable; given that this mode of preservation involves major taphonomic changes, such as flattening, microbial degradation, chemical alteration and replacement. Here, we document a range of taphonomic preservation states in numerous articulated individuals of Fuxianhuia protensa We suggest that organic (partly iron mineral-replaced) bulbous structures in the head region, previously interpreted as brain tissue, along with sagittally located organic strands interpreted as part of the cardiovascular system or as nerve cords, may be better explained as microbial biofilms that developed following decomposition of the intestine, muscle and other connective tissues, forming halos surrounding the original organic remains.

KEYWORDS:

Cambrian; Chengjiang fossil Lagerstätte; cardiovascular system; microbial biofilms; nervous tissue

PMID:
29643211
PMCID:
PMC5904315
DOI:
10.1098/rspb.2018.0051
[Indexed for MEDLINE]
Free PMC Article

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