Odontostoechus lethostigmus, Gomes, 1947

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 : 383

Odontostoechus lethostigmus ( Fig. 12 A-G)

In the spermatozoon of Odontostoechus lethostigmus , the ovoid nucleus measures 1.7  m in the longitudinal axis and 1.1  m in the transverse axis. The surrounding strip of cytoplasm has no organelles ( Fig. 12 A-B). Nuclear rotation toward the flagellar axis was about 60 degrees ( Fig. 12 A-B). The midpiece has a conical shape, measures about 0.9  m in length and contains some elongated mitochondria ( Fig. 12 A-C). The endomembrane system is composed of small vesicles connected to one another and to the plasma membrane, being found peripherally throughout the midpiece ( Fig. 12 A-F).

Figures

Fig. 12. Spermatozoa of Odontostoechus lethostigmus. 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 eccentric position of the double nuclear fossa (double arrow), the midpiece and the cytoplasmic canal (*) containing the initial segment of the flagellum (f). C: Oblique section of the midpiece showing the alveolar aspect of endomembrane system (v). D-F: Cross sections at different levels of the strongly asymmetric midpiece, from the base of the nucleus (n) to the midpiece end exposing the lateral position of the cytoplasmic canal (*) and flagellum (f), and the distribution of the few elongate mitochondria (m) accumulated in larger portion of the midpiece. G: Cross section of the flagella with the classic axoneme (a).