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Article: Parallel evolution of jugal structures in Devonian athyridide brachiopods

Publication: Palaeontology
Volume: 58
Part: 1
Publication Date: January 2015
Page(s): 171 182
Author(s): Wen Guo, Yuanlin Sun and Andrzej Baliński
Addition Information

How to Cite

GUO, W., SUN, Y., BALIŃSKI, A. 2015. Parallel evolution of jugal structures in Devonian athyridide brachiopods. Palaeontology, 58, 1, 171-182.

Author Information

  • Wen Guo - Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing, China (email: cherry.gw@163.com)
  • Yuanlin Sun - Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing, China (email: ylsun@pku.edu.cn)
  • Andrzej Baliński - Instytut Paleobiologii PAN, Warszawa, Polan (email: balinski@twarda.pan.pl)

Publication History

  • Issue published online: 7 JAN 2015
  • Article first published online: 20 OCT 2014
  • Manuscript Accepted: 5 SEP 2014
  • Manuscript Received: 26 JUN 2014

Funded By

National Natural Science Foundation of China (NSFC). Grant Number: 41172001

Online Version Hosted By

Wiley Online Library (Free Access)
Get Article: Wiley Online Library [Free Access]

Abstract

Here, we describe Sinathyris crassa gen. et sp. nov., a new early Emsian (Early Devonian) athyridide brachiopod with a double spiralium from the Guangxi Province of southern China. Unlike the majority of genera of the subfamily Helenathyridinae, which possess accessory spiral lamellae developed directly from the jugal branches, the form described here shows these lamellae arising from a distally bifurcating jugal stem. These differences suggest that the double spiralium in S. crassa might have appeared independently from the double spiralium of the helenathyridins. To test the subfamily assignment of Sinathyris gen. nov., we carried out phylogenetic analyses, which indicate that the new genus is more appropriately referred to the Didymothyridinae. The cladistic analyses of the athyridides indicate that double spiralia have developed independently among these brachiopods at least five times during their evolutionary history.

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