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Article: The Beothukis/Culmofrons problem and its bearing on Ediacaran macrofossil taxonomy: evidence from an exceptional new fossil locality

Palaeontology - Vol. 59 Part 1 - Cover Image
Publication: Palaeontology
Volume: 59
Part: 1
Publication Date: January 2016
Page(s): 45 58
Author(s): Alexander G. Liu, Jack J. Matthews and Duncan McIlroy
Addition Information

How to Cite

LUI, A.G., MATTHEWS, J.J, MCLLROY, D. 2016. The Beothukis/Culmofrons problem and its bearing on Ediacaran macrofossil taxonomy: evidence from an exceptional new fossil locality. Palaeontology, 59, 1, 45-58.

Author Information

  • Alexander G. Liu - School of Earth Sciences, University of Bristol, Bristol, UK
  • Jack J. Matthews - Department of Earth Sciences, University of Oxford, Oxford, UK
  • Duncan McIlroy - Department of Earth Sciences, Prince Philip Drive, Memorial University of Newfoundland, St. John's, NL, Canada

Publication History

  • Issue published online: 18 DEC 2015
  • Article first published online: 15 OCT 2015
  • Manuscript Accepted: 4 SEP 2015
  • Manuscript Received: 15 APR 2015

Funded By

Natural Environment Research Council. Grant Numbers: NE/J5000045/1, NE/L011409/1
Cambridge Philosophical Society
National Geographic Global Exploration Fund. Grant Number: GEFNE22-11

Online Version Hosted By

Wiley Online Library
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The late Ediacaran siliciclastic successions of eastern Newfoundland, Canada, are renowned for their fossils of soft-bodied macro-organisms, which may include some of the earliest animals. Despite the potential importance of such fossils for evolutionary understanding, the taxonomic framework within which Ediacaran macrofossils are described is not clearly defined. Rangeomorphs from a newly discovered fossil surface on the Bonavista Peninsula, Newfoundland, require us to reconsider contemporary use of morphological characters to distinguish between genera and species within Ediacaran taxa. The new surface exhibits remarkable preservational fidelity, resolving features smaller than 0.1 mm in dimension in both frondose and non-frondose taxa. Such preservation permits the recognition of rarely observed fourth- and fifth-order rangeomorph branching, offering unparalleled opportunities to investigate the fine-scale construction of rangeomorph taxa including Culmofrons plumosa Laflamme et al., 2012. Our observations enable resolution of taxonomic issues relating to rangeomorphs, specifically overlap between the diagnoses of the frondose genera Beothukis Brasier and Antcliffe, 2009 and Culmofrons. We propose a taxonomic framework for all Ediacaran macrofossils whereby gross architecture, the presence/absence of discrete morphological characters and consideration of growth programme are used to distinguish genera, whereas morphometric or continuous characters define taxa at the species level. On the basis of its morphological characters, Culmofrons plumosa is herein synonymized to a species (Beothukis plumosa comb. nov.) within the genus Beothukis. This discussion emphasizes the need to standardize the taxonomic approach used to describe Ediacaran macrofossil taxa at both the genus and species levels, and raises important considerations for future formulation of higher-level taxonomic groups.

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