Definition: Adult stage of a cephaline gregarine, a sporozoan parasite commonly found in arthropods and other invertebrate hosts. The body is usually divided by a septum into an anterior epimerite and protomerite and a posterior deutomerite; acephaline gregarines lack a dividing septum.
[cephalo- + G. ōn (ont-), being]
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Examples: glitazone, GI cocktail, etc.