Figure 5 in Sexual anatomy of the flounder Citharichthys spilopterus (Paralichthyidae)

Figure 5. – Histological aspects (haematoxylin and eosin, and Masson trichrome) of the reproductive system of Citharichthys spilopterus. A: Cross section of the mature ovary (samples in March); B: Increased view of an ovigerous lamella showing oocytes at different stages of development (samples in January); C: Cross section of both testes and archinephric ducts; D: Organization of cysts connected by interstitial tissue of the testis; E: Cross section of the urinary bladder and both spermatic ducts; F: Cross section of the left spermatic duct showing spermatic ductules plenty of sperm (C-F, from samples in February and March). L = lumen, LA = ovarian lamellae, PG = primary growth oocytes, PGca = primary growth oocytes cortical alveoli, PGmn = primary growth oocytes nucleoli, PGpn = primary growth oocytes perinucleoli, Sc = primary spermatocytes, the double arrow limit a cyst, SG = secondary growth oocytes, Sg = spermatogonia, SGe = secondary early oocytes, SGI = secondary late oocytes, St = spermatids, the double arrow limit a cyst, Sz = spermatozoa, TL = testicular lobule; bv = blood vessel, ce = columnar epithelium, ct = connective tissue, m = muscle, p = peritoneum.