Haemolymph osmoregulation and the fate of sodium and chloride during dehydration in terrestrial isopods1This paper is dedicated to the memory of the late Dr Sina Sazgar whose rare gifts and humanity elevated all who knew and worked with him.1

Osmoregulation of the haemolymph during dehydration was investigated in a selection of temperate oniscidean isopods. Inulin tracer studies show that the haemolymph contributes approximately 69% of water losses in Porcellio scaber, significantly more than predicted from the volume of this compartment (42% of total water). Haemolymph osmolality increases linearly as a function of haemolymph dehydration but at a significantly lower rate than …