Gregarinida

noun plural

Greg·​a·​rin·​i·​da ˌgreg-ə-ˈrin-ə-də 

: a large order of parasitic vermiform sporozoan protozoans that usually occur in insects and other invertebrates

gregarine

ˈgreg-ə-ˌrīn  -ˌrēn 

-rən

noun or adjective