Bryconacidnus ellisi (Fig. 5 A-E)

In the spermatozoon of Bryconacidnus ellisi, the ovoid nucleus measures 1.7 µ m in the longitudinal axis and 1.4 µ m in the transverse axis. The surrounding strip of cytoplasm has no organelles (Fig. 5A). Nuclear rotation toward the flagellar axis was about 80 degrees (Fig. 5A). The midpiece has a conical shape, measures approximately 0.5 µ m in length and contains some elongate mitochondria. The endomembrane system is composed by small vesicles with a lacy aspect and connected to the plasma membrane (Fig. 5 B-E).