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(invertebrate zoology)
A subclass of protozoans in the class Telosporea; typically intracellular parasites of epithelial tissue in vertebrates and invertebrates.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



an order of one-celled animals of the class Sporozoa. There are approximately 1,000 species. They are intracellular parasites of the epithelial tissue primarily of the digestive organs of invertebrates (annelid worms, mollusks, and arthropods) and vertebrates. They look like small rounded cells with a bubble-shaped nucleus.

Almost every species of Coccidia parasitizes only one definite species of animal host. Most Coccidia exhibit regular alternation of asexual reproduction (schizogony), a sexual process, and sporogony. Asexual reproduction is absent only in the most primitive group—Protococcidiida (genus Eucoccidium). Spores keep the sporozoites viable outside the host’s body for several months, until the oocyst is swallowed by the animal host. The majority of species of Coccidia develop in one host. Some Coccidia have two—for example, members of the genus Aggregata undergo asexual reproduction (schizogony) in crabs and the sexual process and sporogony in gastropod mollusks. Coccidia are very widely distributed. Some cause coccidiosis.


Kheisin, E. M. Zhiznennye tsikly koktsidii domashnikh zhivotnykh. Leningrad, 1967.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Few studies have examined the effect of the supplements used in this study on coccidian infections.
This coccidian has been reported from 12 other species of New World marmotine rodents and has been previously recorded from Arizona and 10 other states as well as from Baja California Norte, Mexico (Hill and Duszynski, 1986; Wilber et al., 1998; Ryan et al., 2001).
[14.] Hashullah A, Akiba Y, Takano H and K Ogimoto Seasonal distribution of bovine coccidian in beef cattle herd in the University farm.
dispar was the most common parasite isolated in contrast to many studies, where coccidian parasites were more commonly isolated in this group of patients.
All chicks were maintained free from coccidian infection.
The health issues included ear mites, ear infections, giardia, nasal discharge, pneumonia, kennel cough, parasites, vomiting, diarrhea, parvovirus, roundworms, coccidian, lethargy, congenital defects and hypoglycemia.
This book will be valuable to students, researchers and practitioners of protozoology, coccidian biology, veterinary science and zoology.
is a human coccidian parasite related to fecal transmission (Frenkel et al., 2003).
Results of the study demonstrated equipotent efficacy of pure berberine in comparison to that of standard drug amprolium on the basis of reduction in coccidian oocyst output, body weight gain of chicken and feed conversion ratio.