Myxozoa is a subphylum of aquatic animals that are part of the phylum Cnidaria have many classes, orders, and families.
Myxozoa (etymology: Greek:  myxa "slime" or "mucus" + thematic vowel o +  zoon "animal") is an unranked subphylum of aquatic, obligately parasitic cnidarian animals and contains the smallest animals ever known to have lived. Cnidaria Phylum: For this reason, the mixozoan taxonomy has undergone great and important changes in its levels of generic, family and suborder classification. 
