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Testing the protozoan hypothesis for Ediacaran fossils: a developmental analysis of Palaeopascichnus

Antcliffe, Jonathan B., Gooday, Andrew J. and Brasier, Martin D. (2011) Testing the protozoan hypothesis for Ediacaran fossils: a developmental analysis of Palaeopascichnus Palaeontology, 54, (5), pp. 1157-1175. (doi:10.1111/j.1475-4983.2011.01058.x).

Record type: Article


The hypothesis that the Ediacara biota were giant protozoans is tested by considering the external morphology, internal organization, suggested fossil representatives and molecular phylogeny of the xenophyophores. From this analysis, we find no case to support a direct relationship. Rather, the xenophyophores are here regarded as a group of recently evolved Foraminifera and are hence unlikely to have a record from the Ediacaran Period. Further from the growth dynamics of Foraminifera, they are also unlikely to be related to the Palaeopascichnus organism. We also find significant distinctions in the growth dynamics of Palaeopascichnus and organisms usually referred to the Ediacara biota, such as Charnia and Dickinsonia. Developmental analysis of the Palaeopascichnus– central to the xenophyophore hypothesis – reveals unusual, protozoan features, including evidence for chaotic repair structures, for mergence of coeval forms, as well as complex bifurcations. These observations suggest that Palaeopascichnus is a body fossil of an unidentified protozoan but is unrepresentative of Ediacaran body construction, in general.

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Published date: September 2011
Keywords: Palaeopascichnus, Ediacara biota, Protozoa, zenophyophores, development, evolution
Organisations: Marine Biogeochemistry


Local EPrints ID: 197517
ISSN: 0031-0239
PURE UUID: 332cef76-2e61-4fe7-ac6d-718fee15622c

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Date deposited: 23 Sep 2011 14:20
Last modified: 18 Jul 2017 11:20

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Author: Jonathan B. Antcliffe
Author: Andrew J. Gooday
Author: Martin D. Brasier

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