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Interambulacral Plate Atrophy in Lovenia woodsi (Etheridge Fil.)

Published online by Cambridge University Press:  01 May 2009

G. M. Philip
G. M. Philip
Affiliation:
Department of Geology, University of Melbourne, Victoria, Australia.
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Abstract

Plate atrophy (“plate crushing”) giving rise to interambulacral plates analogous to demi-plates immediately above the ambitus is described in the Miocene spatangoid Lovenia woodsi, from Beaumaris, Victoria. It appears to be caused by the development of large primary tubercles on the aboral surface, which causes the expansion of the lowest tubercle-bearing plates during ontogeny, so that the more ventral interambulacral plates are squeezed against the ambitus.

Type
Articles
Information
Geological Magazine , Volume 94 , Issue 5 , October 1957 , pp. 402 - 408
Copyright
Copyright © Cambridge University Press 1957

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References

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