Fig. 9
The fine structure of the spermatogonia of Quatuoralisia malakhovi. a Basal part of the germinative epithelium containing spermatogonia (sg), spermatocytes (sc), and interstitial cells (ic). Frames show the areas enlarged in Fig. 8e and 9c. b Longitudinal section of spermatogonium (sg). c Transverse section of two adjacent spermatogonia. ac, amoebocyte; sc, spermatocyte; sg, spermatogonium; hs, haemal sinus; ic, interstitial cell; mc, muscle cell; mtc, mitochondrion; ncl, nucleus of spermatogonium; nl, nucleolus; tc, trunk coelom