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Figure 2.

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Mature spermatozoon of Collyricloides massanae. (a, b) Cross-sections in Region II or the ornamented zone of the mature spermatozoon exhibiting the mitochondrion (M), external ornamentation of the plasma membrane (EO) and spine-like body (SB). Note the association “external ornamentation + cortical microtubules”. (c, d) Region III or transitional area before nuclear appearance, exhibiting in cross-sections, only both axonemes, mitochondrion (M) and few cortical microtubules (CM). (e, f) Cross-sections in the proximal part of Region IV, showing the nucleus (N) accompanied by mitochondrion and cortical microtubules. Note the increase in size of the nucleus and its eccentric position. Scale in μm: 0.3.

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