Fig. 12 in A new genus and two new species of Stevardiinae (Characiformes: Characidae) with a hypothesis on their relationships based on morphological and histological data

Fig. 12. Spermatozoa of Planaltina myersi (MZUSP 100642, 32.1 mm SL). A: Longitudinal section of spermatozoa. Note the lateral position of the nucleus (n) in relation to the flagellar axis, the midpiece and the cytoplasmic canal (*) into which is the initial segment of the flagellum (f). Inset: The proximal centriole is anterior and in an obtuse angle in relation to the distal centriole. Innumerable fibrils or striated centriolar rootlets radiate from the distal centriole (p), surround the tip of the nucleus forming a thick cap. B-E: Cross sections at different levels of the nucleus showing the lateral position of the distal centriole (c). F-G: Cross sections at different levels of the strongly asymmetric midpiece with some spherical mitochondria (m) accumulated in major portion.