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Sci Rep. 2014 May 15;4:4682. doi: 10.1038/srep04682.

An early Cambrian agglutinated tubular lophophorate with brachiopod characters.

Author information

1
1] Early Life Institute, State Key Laboratory of Continental Dynamics and Department of Geology, Northwest University, Xi'an, 710069, China [2] LPS, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, 210008, China.
2
LPS, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, 210008, China.
3
Uppsala University, Department of Earth Sciences, Palaeobiology, Villavägen 16, SE-752 36 Uppsala, Sweden.
4
Department of Biological Sciences, Macquarie University, Sydney, New South Wales 2109, Australia.
5
University of Glasgow, Department of Geographical and Earth Sciences, Gregory Building, Lilybank Gardens, G12 8QQ, Glasgow, United Kingdom.
6
Department of Palaeobiology, Swedish Museum of Natural History, Box 50007, SE-104 05 Stockholm, Sweden.
7
Early Life Institute, State Key Laboratory of Continental Dynamics and Department of Geology, Northwest University, Xi'an, 710069, China.

Erratum in

  • Sci Rep. 2014;4:5502.

Abstract

The morphological disparity of lophotrochozoan phyla makes it difficult to predict the morphology of the last common ancestor. Only fossils of stem groups can help discover the morphological transitions that occurred along the roots of these phyla. Here, we describe a tubular fossil Yuganotheca elegans gen. et sp. nov. from the Cambrian (Stage 3) Chengjiang Lagerstätte (Yunnan, China) that exhibits an unusual combination of phoronid, brachiopod and tommotiid (Cambrian problematica) characters, notably a pair of agglutinated valves, enclosing a horseshoe-shaped lophophore, supported by a lower bipartite tubular attachment structure with a long pedicle with coelomic space. The terminal bulb of the pedicle provided anchorage in soft sediment. The discovery has important implications for the early evolution of lophotrochozoans, suggesting rooting of brachiopods into the sessile lophotrochozoans and the origination of their bivalved bauplan preceding the biomineralization of shell valves in crown brachiopods.

PMID:
24828016
PMCID:
PMC4021322
DOI:
10.1038/srep04682
[Indexed for MEDLINE]
Free PMC Article

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