A longitudinal section of a muscle larva of Trichinella spiralis.

This worm seems to be a male because genital primordial cells (GP) have less glycogen aggregares in the cytoplasma. @Usually female worms have more glycogen aggregares.
(Yuzo Takahashi, Junko Furuki, Yoshiro Yoshikawa, Shoji Yamada and Tsuneji Araki Sex-differentiating criteria for Trichinella spiralis muscle larvae in tissue sections. Japanese Journal of Parasitology 1987 36,367-370)