(A–H) Transmission electron micrographs of the posterior region (or region IV) of the mature spermatozoon of Tergestia laticollis. Scale bars = 0.2 μm. Cross-sections in region IV of mature spermatozoon of Tergestia laticollis showing the appearance of the nucleus (A–B), then the second mitochondrion (M2) (C). (D–E) Cross-sections showing progressively the disappearance firstly of the second mitochondrion and cortical microtubules. (F) Cross-section showing the disorganization of axoneme 2 (Pae2). (G) Cross-section in the posterior extremity of the spermatozoon exhibiting only the nucleus and a few granules of glycogen. (I–J). Transmission electron micrograph showing many sections of the mature spermatozoon of Tergestia laticollis with granules of glycogen (G) highlighted by the Thiéry method. Scale bars = 0.5 μm.