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. Author manuscript; available in PMC: 2020 Nov 5.
Published in final edited form as: Biol Rev Camb Philos Soc. 2019 Nov 18;95(2):365–392. doi: 10.1111/brv.12569

Fig. 3.

Fig. 3.

Scanning electron micrographs of Octopus vulgaris spermatozoon collected from (A) the spermatophore, with an intact outer membrane covering the acrosome, and (B) from the female oviducal gland, following post-ejaculatory modifications to sperm (PEMS) to reveal the corkscrew-shaped acrosome. Inset in A shows magnification of the acrosomal region. Arrows indicate indentations separating the acrosome, nuclear and midpiece regions. Adopted with permission from Tosti et al. (2001). Scale bars: A, 3.0 μm; B, 2.0 μm.