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The Larvae of the Spatangidae

Published online by Cambridge University Press:  11 May 2009

C. B. Rees
C. B. Rees
Affiliation:
The Scottish Marine Biological Association, Oceanographic Laboratory, Edinburgh
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Extract

An account is given of the general structure of the body skeleton of the spatangid larva. A considerable change occurs in the skeleton as the larva increases in size, some parts being absorbed and new parts appearing. Of particular interest is the replacement of the anterior transverse rod by the ventral horizontal rod.

The skeletons of larvae, young stages to late stages, of Echinocardium cordatum, E. flavescens, Spatangus purpureus and Brissopsis lyrifera are described. The larvae of Echinocardium and Spatangus are, in essentials, very similar; that of Brissopsis differs greatly from them. A striking difference is that in Brissopsis the ventral horizontal rod arises from the postoral arm and anterior to the anterior transverse rod, in the other two genera it arises from the body rod posterior to the anterior transverse rod.

The replacement of the anterior transverse rod by a ventral horizontal rod is probably normal in clypeastroid larvae also.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 32 , Issue 2 , October 1953 , pp. 477 - 490
Copyright
Copyright © Marine Biological Association of the United Kingdom 1953

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