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Journal of Experimental Biology 92,23-35 (1981)
Published by Company of Biologists 1981

Ultrafiltration in the Branchial Heart Appendage of Dibranchiate Cephalopods: A Comparative Ultrastructural and Physiological Study

R. SCHIPP 1 and F. HEVERT 2

1 Institut für Allgemeine und Spezielle Zoologie der Justus-Liebig-Universität D 6300 Giessen, F.R. Germany
2 Station de Biologie Marine Arcachon France, and Laboratoire Arago Banyuls-sur-Mer, France

It is shown that ultrafiltration could be the first step in urine formation in Sepia officinalis and Octopus vulgaris. The organization of the podocytes indicates that ultrafiltration can occur through these cells. They have a thick basal lamina in contact with the peripheral blood lacunae, and the cell apices lie in infoldings of the lumen of the appendage. Comparison between the colloid-osmotic and the hydrostatic pressures of the fluids in the branchial heart and the pericardial coelom shows that an ultrafiltration can take place during the branchial heart systole as well as during a long phase of the diastole. Comparison of the osmolalities of blood, coelomic fluid, renal-sac fluid, and sea water shows that these species are hypoosmotic regulators.

Submitted on July 22, 1980






© The Company of Biologists Ltd 1981