1. Sporozoites are very small, slightly curved and pointed at both ends.
2. It is 10-14µm long and 0.05-1.00µm wide.
3. Its body covering is called pellicle. The pellicle is strong and flexible. It is composed of vertical and contractile microtubules.
4. It has a cup-shaped apical cup at its tip. The apical cup is composed of three ring-like segments.
5. It opens a pair of organs called rhoptry. It secretes enzymes that dissolve liver cell membranes.