Fig. 1
From: Subfamily hypostominae: similarities and differences in testicular structure of amazonian fish
species morphology and testicular structure. a,b,c External morphology of the species; d Schematic representation of the testicle of the species where the organ is paired and forms a spermatic duct that leads to the urogenital papilla; e Photomicrography of the mature B. xanthellus gonad showing germinal and intestinal compartments Scale bar: 25 μm; f Schematic representation of the interstitial compartment containing blood vessels (BV), myoid cells (MY), interstitial or Leydig (LE) cells. Seminiferous tubules formed by germinative compartment, containing Sertoli cells (S), spermatogonia (SgA/SgB), spermatocytes (Sc), spermatids (St) and spermatozoa (Sz)