Gregarina polymorpha from the gut of the mealworm of Tenebrio molitor.  The interdigitating membrane in the upper portion of the photo reveals the intrusion of the epimerite into the host (H) tissue.  Septate desmosomes (SD) serve the attachment to the host tissue.  Pinocytotic vacuoles (PV) can be seen at the epimerite membrane as well as numerous free ribosomes (R).  The epimerite actively takes nutrients from the mucosal lining and later the protomerite and deutomerite detach, drift into the lumen, where they fuse in syzygy.  55,000x.