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The anatomy of the body wall and appendages in Arenicola marina L., Arenicola claparedii Levinsen and Arenicola Ecaudata Johnston

Published online by Cambridge University Press:  11 May 2009

G. P. Wells
G. P. Wells
Affiliation:
Department of Zoology, University College, London
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Extract

Worms for dissection, or for museum preservation, should be prepared by the magnesium-formalin method, of which two modifications are given in the text.

The body of Arenicola is differentiated into: (a) an achaetous ‘head’, comprising the prostomium and a small number (probably two) of subsequent segments, (b) a ‘trunk’, composed of a number, varying somewhat with the species, of chaetigerous segments, and (c) a ‘tail’, which may or may not be chaetigerous according to the species. The method of subdividing the body according to the distribution of the gills, so often met with in the literature, is misleading because it conceals the very fundamental differentiation between ‘head’ and ‘trunk’.

The main layers of the body wall are described. There are grounds for supposing that the circular muscle layer plays a greater part than the longitudinal in the maintenance of a postural fluid pressure in active worms.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 29 , Issue 1 , April 1950 , pp. 1 - 44
Copyright
Copyright © Marine Biological Association of the United Kingdom 1950

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