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Title: Eucoccidiorida  
Author: World Heritage Encyclopedia
Language: English
Subject: Apicomplexa, Toxoplasma gondii, Coccidia, Hepatozoon, Eimeria acervulina, Eimeria tenella, Eimeria, Eimeria maxima, Neospora caninum, Besnoitia bennetti
Publisher: World Heritage Encyclopedia


Toxoplasma gondii tachyzoites
Scientific classification
Domain: Eukaryota
Kingdom: Chromalveolata
Superphylum: Alveolata
Phylum: Apicomplexa
Class: Conoidasida
Subclass: Coccidiasina
Order: Eucoccidiorida
Léger & Duboscq, 1910

Eucoccidiorida is an order of microscopic, spore-forming, single-celled parasites belonging to the apicomplexan class Conoidasida. Protozoans of this order include parasites of humans, and both domesticated and wild animals including birds. Among these parasites are the Toxoplasma gondii that cause toxoplasmosis and Isospora belli, which results in isosporiasis.


This is the largest order in the class Conoidasida and contains those species that all undergo merogony (asexual), gametogony (sexual) and sporogony (spore formation) during their life cycle


There are 19 families, 3 subfamilies and 69 genera recognised in this order. In alphabetical order the genera are:

Adelea, Adelina, Aggregata, Alveocystis, Atoxoplasma, Babesiosoma, Barrouxia, Besnoitia, Calyptospora, Caryospora, Caryotropha, Chagasella, Choleoeimeria, Cryptosporidium, Crystallospora, Cyclospora, Cyrilia, Cystoisospora, Dactylosoma, Desseria, Diaspora, Dorisa, Dorisiella, Eimeria, Elleipsisoma, Epieimeria, Frenkelia, Ganapatiella, Gibbsia, Goussia, Gousseffia, Grasseella, Hammondia, Haemogregarina, Hemolivia, Hepatozoon, Hoarella, Hyaloklossia, Isospora, Ithania, Karyolysus, Klossia, Klossiella, Lankesterella, Legerella, Margolisiella, Mantonella, Merocystis, Nephroisospora, Neospora, Octosporella, Orcheobius, Ovivora, Pfeifferinella, Polysporella, Pseudoklossia, Pythonella, Rasajeyna, Sarcocystis, Schellackia, Selenococcidium, Selysina, Sivatoshella, Skrjabinella, Spirocystis, Toxoplasma, Tyzzeria, Wenyonella


Among the heteroxenous and cyst forming genera are: Besnoitia, Cystoisospora, Frenkelia, Hammondia, Neospora, Sarcocystis and Toxoplasma.


The taxonomy of this group is complex and only partly understood. Two major clades have been identified: the isosporoid coccidia (Toxoplasma, Neospora, Isospora [in part], and Sarcocystis) and a second clade containing Lankesterella, Caryospora and the eimeriid coccidia (Cyclospora, Isospora [in part] and Eimeria).[1] Isospora is more closely related to the Toxoplasma/Neospora clade than to Sarcocystis.[2]


There are ~1,000 species in the genus Eimeria.

Some of the genera have been organised into families.

  • Family Barrouxiidae
    • Genera
      • Barrouxia
      • Goussia
  • Family Sarcocystidae
    • Genera
      • Besnoitia
      • Cystoisospora
      • Neospora
      • Sarcocystis
      • Toxoplasma


External links

  • Taxon: Order Eucoccidiorida Léger & Duboscq, 1910, The Taxonomicon.
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