Archigregarinida
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Archigregarinida
(¦är·kē′greg·ə′rin·ə·də)
(invertebrate zoology) An order of telosporean protozoans in the subclass Gregarinia; endoparasites of invertebrates and lower chordates.
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Archigregarinida
McGraw-Hill Science & Technology Encyclopedia:
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Archigregarinida
An order of the protozoan subclass Gregarinia, class Telosporea, subphylum Sporozoa. All gregarines are parasites of the digestive tract and body cavity of invertebrates or lower chordates; their large, mature trophozoites (vegetative stages) live outside the host's cells. The Archigregarinida are primitive gregarines and live in marine worms (annelids and lower chordates—enteropneustids, sipunculids, and ascidians). Their life cycle includes sexual and asexual phases and involves three periods of schizogony (multiple fission). There are only 28 named species in five genera. The most important genus is Selenidium, which has 24 species. Its members occur in the intestine of marine polychaete annelids, sipunculids, enteropneustids, and ascidians. See also Gregarinia; Protozoa; Sporozoa.
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