Ediacaran developmental biology

Dunn, Frances S. and Liu, Alexander G. and Donoghue, Philip C. J. (2017) Ediacaran developmental biology. Biological Reviews, 93 (2). pp. 914-932. ISSN 14647931 DOI https://doi.org/10.1111/brv.12379

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Abstract

Rocks of the Ediacaran System (635–541 Ma) preserve fossil evidence of some of the earliest complex macroscopic organisms, many of which have been interpreted as animals. However, the unusual morphologies of some of these organisms have made it difficult to resolve their biological relationships to modern metazoan groups. Alternative competing phylogenetic interpretations have been proposed for Ediacaran taxa, including algae, fungi, lichens, rhizoid protists, and even an extinct higher‐order group (Vendobionta). If a metazoan affinity can be demonstrated for these organisms, as advocated by many researchers, they could prove informative in debates concerning the evolution of the metazoan body axis, the making and breaking of axial symmetries, and the appearance of a metameric body plan. Attempts to decipher members of the enigmatic Ediacaran macrobiota have largely involved study of morphology: comparative analysis of their developmental phases has received little attention. Here we present what is known of ontogeny across the three iconic Ediacaran taxa Charnia masoni, Dickinsonia costata and Pteridinium simplex, together with new ontogenetic data and insights. We use these data and interpretations to re‐evaluate the phylogenetic position of the broader Ediacaran morphogroups to which these taxa are considered to belong (rangeomorphs, dickinsoniomorphs and erniettomorphs). We conclude, based on the available evidence, that the affinities of the rangeomorphs and the dickinsoniomorphs lie within Metazoa.

Item Type: Article
Uncontrolled Keywords: 2018AREP; IA74
Subjects: 04 - Palaeobiology
Divisions: 04 - Palaeobiology
07 - Gold Open Access
Journal or Publication Title: Biological Reviews
Volume: 93
Page Range: pp. 914-932
Identification Number: https://doi.org/10.1111/brv.12379
Depositing User: Sarah Humbert
Date Deposited: 21 May 2018 10:59
Last Modified: 21 May 2018 10:59
URI: http://eprints.esc.cam.ac.uk/id/eprint/4279

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