Figure 4
From: Diversity and evolution of sex determination systems in terrestrial isopods
Schematics of the internal organs of a terrestrial isopod (Oniscus asellus) in ventral view. Androgenic glands, composed of a cellular mass excreting androgenic hormone, are located at the top of each testis, included in the suspensory filament. Depending on the species, its size is 250–700 µm in length and 20–150 µm in width.
