On the morphological value of the glycerid-goniadid prostomium and its appendages (Polychaeta)

Author: Orrhage, L.

Source: Acta Zoologica, Volume 80, Number 3, 1 August 1999 , pp. 251-264(14)

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Abstract:

Earlier papers dealing with the anatomy of glycerids and goniadids were studied. Thereby, it was found that information about the architecture of the cephalic nervous system of these families was incomplete and in many cases quite contradictory. As a consequence of this, opinions on the morphological value of the conical forward extension of the body (the prostomium) and its appendages diverged. In the present paper the microanatomy of the brain and the innervation of, inter alia, the prostomial structures and the nuchal organs of Glycera rouxii, Gl. alba, Gl. sp. (Glyceridae) and Goniada maculata (Goniadidae) are described. The results are summarized in schematic diagrams and compared with similar observations on other polychaete families. Thereby, the earlier idea that the prostomium of the families in question consists of two fused palps is strengthened. In contrast to earlier opinions, the appendages at the tip of the prostomium are interpreted as structures sui generis.

Keywords: CNS; protomium; palps; glyceridae; goniadidae; Polychaeta

Document Type: Research article

Publication date: 1999-08-01