Becker, Elery R. Division of Life Sciences, Arizona State University, Tempe, Arizona.
Levine, Norman D. College of Veterinary Medicine, University of Illinois, Urbana, Illinois.
A class of the subphylum Sporozoa. These protozoa are divided into two subclasses, the Gregarinia and Coccidia. All members of the group are either intra- or extracellular parasites, and the life cycles have both sexual and asexual phases. The spores lack a polar capsule and develop from an oocyst. The sporozoite is the usual infective stage which initiates the asexual phase in the life cycle. See also: Coccidia; Gregarinia; Protozoa; Sporozoa
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