Hemibrycon surinamensis, Gery, 1962

Baicere-Silva, Clarianna Martins, Ferreira, Katiane M., Malabarba, Luiz R., Benine, Ricardo C. & Quagio-Grassiotto, Irani, 2011, Spermatic characteristics and sperm evolution on the subfamily Stevardiinae (Ostariophysi: Characiformes: Characidae), Neotropical Ichthyology 9 (2), pp. 377-392 : 381

Hemibrycon surinamensis ( Fig. 10 A-F)

In the spermatozoon of Hemibrycon surinamensis the ovoid nucleus measures 1.52  m in the longitudinal axis and 1.2  m in the transverse axis. The surrounding strip of cytoplasm has no organelles ( Fig. 10A ). Nuclear rotation toward the flagellar axis was about 95 degrees ( Fig.10A ).The midpiece has a conical shape, measures about 0.9  m in length and contains some slightly elongatemitochondria( Fig.10A ).Apossibleendomembranesystem seems to be composed of a clump of small vesicles ( Fig.10 B-F).

Figures

Fig. 10. Spermatozoa of Hemibrycon surinamensis. A: Longitudinal section of spermatozoa. Note the lateral position of the nucleus (n) in relation to the flagellar axis and to proximal (p) and distal (d) centrioles, the eccentric position of the double nuclear fossa (double arrow), the midpiece containing a few vesicles (v), and the cytoplasmic canal (*) containing the initial segment of the flagellum (f). B-E: Cross sections through the middle of the nucleus and at different levels of the strongly asymmetric midpiece exposing the lateral position of the centriole (c), cytoplasmic canal (*) and of the flagellum (f), the distribution of the few elongate mitochondria (m) accumulated in larger portion of the midpiece. F: Cross section of the flagellum with classic axoneme (a).