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Surface ornamentation of the echinoid test and its ecologic significance

Published online by Cambridge University Press:  08 February 2016

Susan C. Oldfield
Susan C. Oldfield*
Affiliation:
Department of Zoology and Comparative Physiology, Queen Mary College; Mile End Road, London E1 4NS, England
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Abstract

A scanning electron microscope survey of the regular echinoid test reveals that the outer surface of its component coronal plates may be sculptured with a fine-relief ornament that is species-characteristic for those species presently surveyed. Structural resemblances in surface ornamentation are more marked in species living in similar habitats than in those species that are apparently phyletically related. Plate ornament is related to skeletal magnesium levels. It is tentatively suggested that low growth rate echinoids that inhabit “low-energy” environments (and exhibit low total skeletal magnesium levels) and “high-energy” habitat-exploiting species with high growth rates (and relatively high skeletal magnesium levels) may have differential patterns of plate growth that can be distinguished by the degree of ornamentation of the plate surface.

Type
Research Article
Information
Paleobiology , Volume 2 , Issue 2 , Spring 1976 , pp. 122 - 130
Copyright
Copyright © The Paleontological Society 

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