Fig. 2 in Markiana nigripinnis (Perugia, 1891) as a putative member of the subfamily Stevardiinae (Characiformes: Characidae): spermatic evidence

Fig. 2. Longitudinal sections of early to late spermatids of Markiana nigripinnis LBP 4935. A: Note that the centriolar complex is initially medial to the nucleus (n). B-D: The nuclear rotation toward the flagellar axis, the position of the proximal (p) and distal (d) centrioles, and the dislocation of the mitochondria (m) and cytoplasm to the flagellar portion, forming the cytoplasmic canal (*) and the midpiece (mp) of the spermatozoa.