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The Structure and Mode of Life of the Pyramidellidae, Parasitic Opisthobranchs

Published online by Cambridge University Press:  11 May 2009

V. Fretter  and
A. Graham
V. Fretter
Affiliation:
From the Department of Zoology, Birkbeck College, University of London
A. Graham
Affiliation:
From the Department of Zoology, Birkbeck College, University of London
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Extract

The family Pyramidellidae contains a number of species of gastropod molluscs of similar structure and mode of life.

The shell is calcareous and spirally wound and may be closed by an operculum. The foot bears a transverse fold anteriorly, the mentum (Fig. 1, MT), separating the opening of the penial sheath (PO) below from the mouth (M) above. It has a lateral glandular streak on each side (Fig. 2), presumably sensory.

The head has ear-shaped tentacles (Fig. 1, T), richly innervated and with cilia setting up a strong water current, so that they constitute a powerful sensory mechanism. The eyes (E) lie between the tentacles.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 28 , Issue 2 , October 1949 , pp. 493 - 532
Copyright
Copyright © Marine Biological Association of the United Kingdom 1949

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