Fig. 3

Paraspermatozoa of Adelomelon beckii. a Detail of cohorts of paraspermatozoa showing vermiform shape. Paraspermatozoa Type 1: b LS of the apical region showing electron-dense material as a cap. Axonemes are ending in the granular material beneath the dense cap. c TS through the apex showing sheath of granular material enclosing axonemes and basal body/centriolar complexes. d, e TS of the main body region showing the 22 peripheral axonemes, dense vesicles, less-dense vesicles, some axonemes and a mitochondrion embedded in a dense matrix. e TS of the body region showing 22 peripheral axonemes, dense vesicles, less-dense vesicles and mitochondria. Paraspermatozoa Type 2: f LS of the apical region showing electron-dense material as a cap. g TS near apex of cell showing 47 axonemes and 10 centriolar rootlets. h TS anterior region of cell showing 70 (9 + 2) axonemes. ax Axoneme(s), bb basal body, cr centriolar rootlet, dv dense vesicles, m mitochondrion, pz paraspermatozoa, spz spermatozoa, v less-dense vesicles