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The Ultrastructure of the Heart-Body and Extravasal Tissue in the Polychaete Annelids Neoamphitrite Figulus and Arenicola Marina

Published online by Cambridge University Press:  11 May 2009

T. Braunbeck  and
R. P. Dales
T. Braunbeck
Affiliation:
Universität Heidelberg, Zoologisches Institut Morphologie/Ökologie, Im Neuenheimer Feld 230, D-6900 Heidelberg, W. Germany
R. P. Dales
Affiliation:
Department of Zoology, Bedford College, Egham, Surrey TW20 9TY
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Extract

The heart-body in Neoamphitrite figulus (Dalyell) forms a mass of tissue within the supra-oesophageal vessel almost occluding the lumen. The tissue forms a much-infolded cylinder enclosed by a basal lamina consisting of a fibrous reticulum through which the assembled haemoglobin molecules are discharged into the plasma (Dales & Pell, 1970). A function of both the heart-body and the extravasal (‘chloragogen’) tissue in polychaetes without a heart-body was established by biochemical analysis (Kennedy & Dales, 1958; Dales, 1963, 1965) to be the synthesis of plasma haemoglobin (erythrocruorin) or chlorocruorin. This was confirmed by electron microscopy (TEM) by Breton-Gorius (1963) in Arenicola, Potswald (1969) in Spirorbis, Dales & Pell (1970) in Neoamphitrite, Lattice, Myxicola, Megalomma and Sabella, and by Friedmann & Weiss (1980) in Amphitrite. It would appear that the same tissues also sequester phagocytosed materials (Braunbeck & Dales, 1984). Re-examination of this tissue by trans-mission electron microscopy (TEM) has extended our knowledge of the ultra-structure. Here we discuss these results in relation to the function of these tissues in the production of the respiratory pigments found in the plasma. Some heart-bodies of Terebella lapidaria L., Lattice conchilega (Pallas) and Cirriformia tentaculata (Montagu) have also been examined by TEM for comparison with that of Neoamphitrite figulus.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 65 , Issue 3 , August 1985 , pp. 653 - 662
Copyright
Copyright © Marine Biological Association of the United Kingdom 1985

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References

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