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The Pseudodeltidium of the Strophomenid Brachiopods

Published online by Cambridge University Press:  01 May 2009

Muriel A. Arber
Muriel A. Arber
Affiliation:
Sedgwick Museum, Cambridge
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Extract

The term pseudodeltidium was proposed by Bronn (1862, p. 242) for the shell-plate covering the delthyrium, or triangular opening between the teeth, in the ventral cardinal area of those brachiopods now assigned to the order Protremata. It is typically developed among the “family” Strophomenidae, of which it is a diagnostic feature, as a convex arch overhanging the interior of the ventral valve (Text-fig. 1A). In the embryo, the pseudodeltidium is secreted as a single unit when the shell is first formed, and is therefore not homologous with the deltidium (von Buch, 1834, p. 15) of the order Telotremata, since this is formed in the post-embryonic period as two separate plates which may subsequently coalesce (Beecher, 1892)

Type
Articles
Information
Geological Magazine , Volume 79 , Issue 3 , June 1942 , pp. 179 - 187
Copyright
Copyright © Cambridge University Press 1942

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References

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