Boehlkea fredcochui, Gery, 1966

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

Boehlkea fredcochui ( Fig. 4 A-K)

In the spermatozoon of Boehlkea fredcochui the ovoid nucleus measures 2.0  m in the longitudinal axis and 1.5  m in the transverse axis. The surrounding strip of cytoplasm has large and small vesicles ( Fig. 4 A-C). Nuclear rotation toward the flagellar axis is about 60 degrees ( Fig. 4 A-B). The midpiece has a conical shape and a length of about 1.6  m, and contains some elongate mitochondria ( Fig. 4 A-G). The endomembrane system is composed of larger vesicles connected to a clump of smaller vesicles with a lacy aspect ( Fig. 4 H-K).

Figures

Fig. 4. Spermatozoon of Boehlkea fredcochui. A-B: Longitudinal sections of spermatozoa. Note the position of the nucleus (n) in relation to the flagellar axis and to proximal (p) and distal (d) centrioles, the position of the double nuclear fossa (double arrow), the midpiece and the cytoplasmic canal (*) containing the initial segment of the flagellum (f). The lacy aspect of an endomembrane system and a few vesicles (v) peripherally distributed from the tip of nucleus to the midpiece end. C-K: Cross sections from the middle to the base 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 the larger portion of the midpiece.