Gregarinasina

noun plural

Greg·​a·​rin·​a·​si·​na ˌgreg-ə-ˌrin-ə-ˈsī-nə 

-ˈsē-nə

variants or Gregarinia

ˌgreg-ə-ˈrin-ē-ə 

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

gregarine

ˈgreg-ə-ˌrīn  -ˌrēn 

-rən

noun or adjective