Figures 1–4 in Testisacs microanatomy and spermatogenesis of Helobdella simplex (Hirudinida: Glossiphoniidae)

Figures 1–4. Helobdella simplex, cross section of the testisac in stages I, II and III of spermatogenesis: (1) poliplasts in the testisac lumen; (2) Stage II; (3, 4) Stage III of spermatogenesis. (C) Cytophore, (eg) spermatogonia, (em) testicular funnel, (ep) primary spermatocytes, (es) secondary spermatocytes, (et) spermatids, (ez) spermatozoa, (fa) phagocytes, (lu) testisac lumen, (m) mesothelial cell. Scale bars: 1, 3, 4 = 50 µm, 2 = 10 µm.