zoocyst

from The Century Dictionary.

• noun A cyst, formed by various protozoans and protophytes, whose contents break up into many germinal granules or spores; a kind of sporocyst.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Biol.) A cyst formed by certain Protozoa and unicellular plants which the contents divide into a large number of granules, each of which becomes a germ.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A variety of encysted rhizopods resembling a sporocyst, except in the thickness and number of the protective layer.