Fig. 6

The fine structure of the external wall of the testis in Quatuoralisia malakhovi. a External muscle lining; frames indicate the areas enlarged in figures c, d. b Location of the muscle lining, which envelops the testis; the frame indicates the area enlarged in figure a. c–d Muscle fibers (mf) and cilia (flg) of muscle cells. e Haemal lacuna (hs) of the testis wall; the frame indicates the area enlarged in figure f. f Amoebocytes (ac) within the haemal lacuna. ac, amoebocytes; clg, collagen fibers; flg, flagellum; gep, germinative epithelium; hs, haemal sinus; mc, nuclear parts of muscle cells; mf, muscle fiber; mpr, processes of the muscle cells; ncl, nucleus; rf, rootlet of flagellum; tc, trunk coelom