Abstract
Fine structure of echiurid blood vessels in the proboscis is known in details, but the circulatory system of the trunk remains studied mainly at the level of general anatomy. The investigation of the trunk circulatory system in Bonellia viridis females revealed the presence of specialized podocytes in the ring vessel and anterior part of the ventral vessel. This study allowed to describe podocytes in echiurid circulatory system for the first time. Podocytes of B. viridis are characterized by a typical cellular architecture, which is known for other bilaterians: they consist of a cell body, primary processes, and pedicels that are interconnected via specialized slit diaphragms. The presence of podocytes in the ventral and ring vessels indicates these parts of circulatory system as sites of ultrafiltration in echiurids, i.e., exactly in these palaces, the filtration of plasma occurs through the basal lamina to the body cavity.
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