Abstract
Ultrastructural observation of the renopericardial region in B. glabrata revealed the presence of a site for ultrafiltration located in the proximal region of the kidney sac, in the vicinity of the pericardium. This region comprises podocyte-like cells covering large hemal spaces supplied by a renal artery. Extracellular material observed in spaces between podocyte foot processes resembled small septate junctions rather than diaphragms such as observed in various kidneys. The effective ultrafiltration barrier may be the thick basal lamina of the podocytes. The hemal spaces have a connective tissue frame rich in fixed phagocytes and migrating hemocytes which may play a role in the internal defence system of the snail.
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