Centrioles are absent.
The greatest diversity is found in M sporogonic plasmodia, with a variety of vesicles, fibrillar structures and surface modifications. In both M and A phases, unique modifications of er membranes may be found. Comparison of A and M fine structure reveals an identical structural pattern and supplies another confirmation of the unity of myxozoan life cycle. Polar capsules of myxozoa and nematocysts of cnidarians are homologous in their structure and way of origin. Septate cell junctions are typical both of cnidaria and of myxozoa.