Creagrutus meridionalis (Vari & Harold, 2001)

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

Creagrutus meridionalis ( Fig. 8 A-K)

In the spermatozoon of Creagrutus meridionalis , the ovoid nucleus measures 1.5  m in the longitudinal axis and 1.13  m in the transverse axis. The surrounding strip of cytoplasm has no organelles ( Fig. 8 A-C). Nuclear rotation toward the flagellar axis was about 75 degrees ( Fig. 8A ). The midpiece has a conical shape, measures about 1.47  m in length, and contains some slightly elongate mitochondria ( Fig. 8 A-C). The endomembrane system is composed by vesicles with different sizes connected to clump of smaller vesicles with a lacy aspect ( Fig. 8 D-K).

Figures

Fig. 8. Spermatozoa of Creagrutus meridionalis. A-C: Longitudinal sections 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 position of the double nuclear fossa (double arrow), the midpiece and the cytoplasmic canal (*) containing the initial segment of the flagellum (f). D-K: Cross sections through the middle of the nucleus and at different levels of the strongly asymmetric midpiece exposing the lateral position of the cytoplasmic canal (*) and of the flagellum (f), the distribution of the few elongate mitochondria (m) accumulated in larger portion of the midpiece, the lacy aspect of the endomembrane system and a few vesicles peripherally distributed in the midpiece (v).