Figures 5–9 in Testisacs microanatomy and spermatogenesis of Helobdella simplex (Hirudinida: Glossiphoniidae)

Figures 5–9. Helobdella simplex, cross section of the testisac in stages IV and V of spermatogenesis: (5–7) Stage IV, mature spermatozoa attached to the cytophore and free in the testisac lumen; initiation of reabsorption processes. (8) Reacting and direct (autolysis) reabsorption. (9) Stage V, nuclei of germinal cells with piknosis and hyperchromatosis. (C) Cytophore, (ca) cytophore in autolysis, (ep) primary spermatocytes, (et) spermatids, (ez) spermatozoa, (fa) phagocytes, (p) piknosis. Scale bars: 50 µm.