Spermatic characteristics and sperm evolution on the subfamily Stevardiinae (Ostariophysi: Characiformes: Characidae) Author Baicere-Silva, Clarianna Martins Author Ferreira, Katiane M. Author Malabarba, Luiz R. Author Benine, Ricardo C. Author Quagio-Grassiotto, Irani text Neotropical Ichthyology 2011 2011-05-27 9 2 377 392 http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000200016&lng=en&tlng=en journal article 10.1590/S1679-62252011005000014 1982-0224 5422771 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).