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Article: New radiodonts with gnathobase‐like structures from the Cambrian Chengjiang biota and implications for the systematics of Radiodonta

Papers in Palaeontology - Volume 4 Part 4 - Cover
Publication: Palaeontology
Volume: 4
Part: 4
Publication Date: November 2018
Page(s): 605 621
Author(s): Pei‐Yun Cong, Gregory D. Edgecombe, Allison C. Daley, Jin Guo, Stephen Pates, and Xian‐Guang Hou
DOI: 10.1002/spp2.1219
Addition Information

How to Cite

CONG, P., EDGECOMBE, G.D., DALEY, A.C., GUO, J., PATES, S., HOU, X. 2018. New radiodonts with gnathobase‐like structures from the Cambrian Chengjiang biota and implications for the systematics of Radiodonta. Papers in Palaeontology, 4, 4, 605-621. DOI: /doi/10.1002/spp2.1219

Author Information

  • Pei‐Yun Cong - Yunnan Key Laboratory for Palaeobiology Yunnan University Kunming 650091 China
  • Pei‐Yun Cong - Department of Earth Sciences Natural History Museum Cromwell Road London SW7 5BD UK
  • Pei‐Yun Cong - MEC International Joint Laboratory for Palaeobiology & Palaeoenvironment Yunnan University Kunming 650091 China
  • Gregory D. Edgecombe - Department of Earth Sciences Natural History Museum Cromwell Road London SW7 5BD UK
  • Gregory D. Edgecombe - MEC International Joint Laboratory for Palaeobiology & Palaeoenvironment Yunnan University Kunming 650091 China
  • Allison C. Daley - Institute of Earth Sciences University of Lausanne Lausanne CH‐1015 Switzerland
  • Jin Guo - Management Committee of the Chengjiang Fossil Site World Heritage Chengjiang 652599 China
  • Stephen Pates - Institute of Earth Sciences University of Lausanne Lausanne CH‐1015 Switzerland
  • Stephen Pates - Department of Zoology University of Oxford Oxford OX1 3PS UK
  • Xian‐Guang Hou - Yunnan Key Laboratory for Palaeobiology Yunnan University Kunming 650091 China
  • Xian‐Guang Hou - MEC International Joint Laboratory for Palaeobiology & Palaeoenvironment Yunnan University Kunming 650091 China

Publication History

  • Issue published online: 03 November 2018
  • Manuscript Accepted: 06 March 2018
  • Manuscript Received: 19 October 2017

Funded By

National Science Foundation of China. Grant Numbers: 41572015, U1302232
Leverhulme Trust. Grant Number: RPG‐2015‐441
Oxford‐St Catherine's Brade‐Natural Motion Scholarship

Online Version Hosted By

Wiley Online Library
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Abstract

A recent description of paired gnathobase‐like structures (GLSs) in the head region of the radiodont Amplectobelua symbrachiata raised the question of whether these appendicular structures are more widely spread within Radiodonta, putative lower stem‐group euarthropods. Here we describe a new genus of Radiodonta, Ramskoeldia gen. nov., that also bears GLSs. Its two new species, Ramskoeldia platyacantha sp. nov. and R. consimilis sp. nov., are distinguished based on the morphology of their frontal appendages. The presence of three pairs of GLSs associated with reduced segments posterior to the head and the detailed morphological similarities of the GLSs suggest that Ramskoeldia is closely related to Amplectobelua Hou et al., and they are classified together in the revised Family Amplectobeluidae. Other diagnostic characters of this family include the lack of a radially‐arranged oral cone, instead sharing mouthparts composed of smooth and tuberculate plates, and a frontal appendage with three podomeres in the shaft and prominent larger endites on podomeres 4 and 8. Due to its lack of GLSs and the different morphology of its mouthparts, membership of Lyrarapax Cong et al., in Amplectobeluidae cannot be confirmed. Appraisal of available evidence indicates that the morphology of the feeding structures, including frontal appendages, the mouth apparatus, and GLSs, serves as a fundamental source of characters in the classification of radiodonts.

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