Australian Museum Journal A giant new trimerellide brachiopod from the Wenlock (Early Silurian) of New South Wales, Australia

Shortform:
Strusz et al., 1998, Rec. Aust. Mus. 50(2): 171–186
Author(s):
Strusz, D. L.; Percival, Ian G.; Wright, A. J.; Pickett, John W.; Byrnes, A.
Year published:
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 package:
EndNote file
Title page:
Title page (92kb PDF)
Complete work:
Complete work (4118kb PDF)

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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