Denoting members of the protozoan suborder Acephalina (order Eugregarinida), characterized by simple noncompartmentalized bodies, which parasitize invertebrates.
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Gregarines can be subdivided into two groups: cephalines and acephalines. Trophozoites in the cephaline gregarines assume a substructure in which a small part of the anterior end, the protomerite, is delimited from the nucleated posterior portion, the deuteromerite, by a septum (Perkins, 1991).