Gregarina polymorpha from the mealworm Tenebrio molitor.
This species co-exists with Gregarina cuneata and is larger. This is a
transverse section, revealing the corrugated nature of the cell surface, called
epicytic folds. These are not tubular structures but long folds that
extend lengthwise along these elongate cells. The arrows point to myonemes
which extend along the folds. 70,000x