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Quarterly Journal of Microscopical Science, Vol s3-93, 435-452, Copyright © 1952 by Company of Biologists

The Development and Structure of the Anterior Region of the Body in the Sabellariidae, with special reference to Phragmatopoma californica

R. PHILLIPS DALES 1

1 Sir John Cass College, London

Attention is drawn to the confusion which has been caused by the loose terminology of the anterior appendages in polychaetes, and more exact connotations are proposed. As the prostomium can be recognized as a comparable unit throughout the Polychaeta, a consideration of its constitution is deferred.

In the present paper the development and constitution of the anterior region of the sabellariid worms are considered. The larval development of Phragmatopoma californica (representing the most highly advanced genus) is described, and the structure of the adult of this species is compared with that of species belonging to other genera.

It is concluded that the opercular stalk arises mainly from the first segment; that the opercular paleae represent the notochaetae of the first two segments, and that the oral tentacles and the building organ are also developed from the first segment. The prostomium bears a single pair of tentacles.






© The Company of Biologists Ltd 1952