apicomplexan


apicomplexan

also called  sporozoan 

      any protozoan of the (typically) spore-producing phylum Apicomplexa, which is called by some authorities Sporozoa. All apicomplexans are parasitic and lack contractile vacuoles and locomotor processes. Apicomplexans live within the body cavities or the cells of almost every kind of animal, including other apicomplexans. Some genera are pathogenic: Plasmodium causes malaria, and Eimeria and Isospora cause coccidiosis. Apicomplexans feed by absorbing either dissolved food ingested by the host (saprozoic nutrition) or the host's cytoplasm and body fluids. Respiration and excretion occur by simple diffusion through the cell membrane. In the life cycle, sexual and asexual generations may alternate. Sexual reproduction may immediately precede spore formation. Asexual reproduction is by binary or multiple fission (schizogony).

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Universalium. 2010.

Look at other dictionaries:

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  • apicomplexan — adjective Describing protists of the phylum Apicomplexa …   Wiktionary

  • apicomplexan — ap·i·com·plex·an (ap″ĭ kəm plekґsən) 1. any protozoan of the subphylum Apicomplexa. 2. pertaining or relating to protozoa of the subphylum Apicomplexa …   Medical dictionary

  • apicomplexan — /æpikəmˈplɛksən/ (say apeekuhm pleksuhn) adjective of or relating to the Apicomplexa, a class of parasitic protozoans with a characteristic apical complex allowing it entry to the host cell …   Australian English dictionary

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