Ediacaran developmental biology

Frances Dunn*, Alex Liu, Philip Donoghue

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

32 Citations (Scopus)
345 Downloads (Pure)

Abstract

Rocks of the Ediacaran System (635–541 Ma) contain fossil evidence for some of the earliest complex macroscopic organisms, many of which have been interpreted as early 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), and conclude, based on the available evidence, that the affinities of the rangeomorphs and the dickinsoniomorphs lie within Metazoa.
Original languageEnglish
Number of pages19
JournalBiological Reviews
Early online date3 Nov 2017
DOIs
Publication statusE-pub ahead of print - 3 Nov 2017

Keywords

  • Bilateria
  • Development
  • Ediacaran
  • Eumetazoa
  • Evolution
  • Metazoa

Fingerprint Dive into the research topics of 'Ediacaran developmental biology'. Together they form a unique fingerprint.

Cite this