Abstract

Keteiodoros bellense n.gen. and n.sp. is a remarkably large trimerellide brachiopod from the Wenlock Dripstone Formation, southeast of Wellington, central New South Wales. The probable articulatory mechanism is unusual for trimerellides. It apparently involved both flattened sections of the lateral commissures which acted as pivots for opening and closing the shell, and a large and strongly modified articulating plate (which partly envelopes a robust dorsal umbo) articulating with the pseudointerarea at the posterior end of the ventral platform. The heavy dorsal umbo probably acted as a counterbalance to the anterior part of the valve; the diductor muscles were apparently attached to the umbo at the sides of the articulating plate, and to the anterior end of the ventral platform. The trimerellides occur in presumed life position in nearly monospecific beds which are interpreted as having formed in a quiet inshore shallow subtidal area on a sloping shelf, protected by coral biostromes but periodically disrupted by storm action. They are considered to represent a low-diversity quietwater Benthic Assemblage 2 community.

 
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Bibliographic Data

Short Form
Strusz et al., 1998, Rec. Aust. Mus. 50(2): 171–186
Author
D. L. Strusz; Ian G. Percival; A. J. Wright; John W. Pickett; A. Byrnes
Year
1998
Title
A giant new trimerellide brachiopod from the Wenlock (Early Silurian) of New South Wales, Australia
Serial Title
Records of the Australian Museum
Volume
50
Issue
2
Start Page
171
End Page
186
DOI
10.3853/j.0067-1975.50.1998.1278
Language
English
Date Published
07 October 1998
Cover Date
07 October 1998
ISSN
0067-1975
CODEN
RAUMAJ
Publisher
The Australian Museum
Place Published
Sydney, Australia
Digitized
11 March 2009
Available Online
16 July 2009
Reference Number
1278
EndNote
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Title Page
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Complete Work
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