two trophozoites of Gregarina polymorpha from the gut of the mealworm,
Tenebrio molitor. This photo, stained with basic fuchsin, shows the
initial engagement of the primite (to the right) and the satellite (to the
left). The anterior protomerite of the satellite will eventually indent
into the posterior end of the deutomerite of the primite. At that point, genetic
material will be exchanged. 1000x.