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Significance of the punctation mosaic of the Jurassic thecidellinid brachiopod Moorellina

Published online by Cambridge University Press:  01 May 2009

P. G. Baker
P. G. Baker
Affiliation:
Department of Biological Sciences, Derby and District College of Technology, Kedleston Road, Derby, DE3 1GB
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Summary

Study of the punctation mosaics of Moorellina granulosa (Moore) and Moorellina ornata (Davidson), revealed by serial sectioning and stereoscan photomicrographs, shows that the apparent random distribution of punctae may be reconciled to two superimposed regular insertion patterns. Careful plotting of the endopunctae of M. granulosa from serial, cellulose acetate peels, reveals the presence of impersistent punctae. A new model is proposed, based on superimposed insertion patterns and offering an explanation for impersistence of punctae.

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Type
Articles
Information
Geological Magazine , Volume 107 , Issue 2 , March 1970 , pp. 105 - 111
Copyright
Copyright © Cambridge University Press 1970

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References

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