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A re-examination of the Nama-type Vendian organism Rangea schneiderhoehni

Published online by Cambridge University Press:  25 July 2005

DIMA GRAZHDANKIN  and
ADOLF SEILACHER
DIMA GRAZHDANKIN
Affiliation:
Paleontological Institute, Profsoyuznaya Street 123, Moscow 117647, Russia Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK
ADOLF SEILACHER
Affiliation:
Institut für Geologie und Paläontologie, Sigwartstr. 10, 72076 Tübingen, Germany Geology & Geophysics Department, Yale University, P.O. Box 208109, New Haven, CT 06520-8109, USA
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Abstract

The need to re-examine Rangea has been motivated by two factors: first, by the recent progress in the understanding of three-dimensional mouldic preservation of Vendian fossils, and second, by discoveries of this taxon outside Gondwana albeit in the same sedimentary environment as seen in Namibia. Several important features are revealed, including the in situ posture in the sediment, the double-layered quilted structure, the tripartite stemless body and the mucous-supported sheath in the sediment. It is suggested that Rangea represents an infaunal organism, and that the similarity with other members of the Nama-type biota reflects convergence in functional and fabricational constraints in relation to infaunal life habit.

Keywords

NeoproterozoicVendianNama Grouptaphonomytaxonomy
Type
Original Article
Information
Geological Magazine , Volume 142 , Issue 5 , September 2005 , pp. 571 - 582
Copyright
© 2005 Cambridge University Press

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