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Upper Ordovician cliefdenellids (Porifera: Sphinctozoa) from China

Published online by Cambridge University Press:  01 May 2009

B. D. Webby  and
Lin Baoyu
B. D. Webby
Affiliation:
Department of Geology & Geophysics, University of Sydney, N.S.W., 2006, Australia
Lin Baoyu
Affiliation:
Institute of Geology, Chinese Academy of Geological Sciences, Beijing, P.R. China
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Abstract

Aporate sphinctozoan sponges of the Family Cliefdenellidae Webby, 1969, are described for the Upper Ordovician (Ashgill) of northern and northwest China, including the new genus Khalfinaea and a new species K. shaanxiensis. They are characteristic cliefdenellids with conico-cylindrical and branching forms, a single central tube defined by a thickened, sieve-like endowall, and a filling of irregularly orientated astrorhizal canals, vesicles and thickened (?trabecular) tissue

Taxonomic relationships of the other cliefdenellids are also discussed. The conception of the genus Cliefdenella Webby, 1969, is restricted to those forms with massive, hemispherical to explanate form and multiple, bundled vertical excurrent canal-clusters, and the new genus Rigbyetia is introduced to include conico-cylindrical and branching forms with a central tube composed of a single, vertical, bundled, excurrent canal-cluster

In terms of their biogeographical record, the cliefdenellids have a restricted distribution in the Upper Ordovician (middle Caradoc-Ashgill) ‘fold-belt’ successions of the Palaeo-Pacific region (eastern Australia, Alaska and northern California) and in Asia (northern China, and in the Chinese and Soviet Altai)

Type
Articles
Information
Geological Magazine , Volume 125 , Issue 2 , March 1988 , pp. 149 - 159
Copyright
Copyright © Cambridge University Press 1988

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