| 词条 | Piroplasmida |
| 释义 |
| image = Babiesa spp.jpg | image_alt = "Babesia" sp. | image_caption = Babesia sp. | display_parents = 6 | taxon = Piroplasmida | subdivision_ranks = Families and Genera | subdivision =
}}Piroplasmida is an order of parasites in the phylum Apicomplexa.[2][3] They divide by binary fission and as sporozoan parasites they possess sexual and asexual phases (sexual reproduction occurs in the tick gut[4]). They include the tick parasites Babesia and Theileria.[5][6] DescriptionThey are minute rounded or pyriform parasites found within erythrocytes, or other circulating or endothelial cells of vertebrates, where they reproduce by merogony. The trophozoite stage is separated from erythrocyte by a single membrane. This distinguishes them from other blood parasites that usually have at least two membranes. An apical complex with a polar ring and rhopteries occurs, but without a conoid and usually without associated pellicular microtubules. They lack flagella and do not form either oocysts or spores. The known vectors are ticks or leeches in which they undergo sporogony; sexual reproduction probably occurs in the vector. See also
References1. ^{{cite journal |author=Manwell RD |title=The Genus Dactylosoma |journal=The Journal of Protozoology |volume=11 |issue=4 |pages=526–530 |year=1964 |doi=10.1111/j.1550-7408.1964.tb01792.x }} {{Alveolata}}{{Taxonbar|from=Q1656634}}{{Apicomplexa-stub}}2. ^{{cite web|url=http://cancerweb.ncl.ac.uk/cgi-bin/omd?piroplasmida|title=Definition: piroplasmida from Online Medical Dictionary|author=|date=|website=ncl.ac.uk|accessdate=1 January 2019}} 3. ^{{cite web|url=http://nature.british-towns.net/nature/05_family_menu.asp?GetLOID=832&page=1|title=PIROPLASMIDA; Page 1 of the families of the order; Piroplasmida|author=|date=|website=British Towns and Villages|accessdate=1 January 2019}} 4. ^{{cite journal |vauthors=Rudzinska MA, Spielman A, Lewengrub S, Trager W, Piesman J |title=Sexuality in piroplasms as revealed by electron microscopy in Babesia microti |journal=Proc. Natl. Acad. Sci. U.S.A. |volume=80 |issue=10 |pages=2966–70 |pmid=6574467 |pmc=393954 |url=http://www.pnas.org/cgi/pmidlookup?view=long&pmid=6574467 |doi=10.1073/pnas.80.10.2966|date=May 1983 |bibcode=1983PNAS...80.2966R }} 5. ^{{cite web|url=http://cancerweb.ncl.ac.uk/cgi-bin/omd?Theileriidae|title=Definition: Theileriidae from Online Medical Dictionary|author=|date=|website=ncl.ac.uk|accessdate=1 January 2019}} 6. ^{{cite web|url=http://theileria.animaldiseases.org/index.php?Itemid=29&id=29&option=com_content&task=view|title=Theleriosis: The causal organism and life cycle|author=|date=|website=animaldiseases.org|accessdate=1 January 2019}} 2 : Apicomplexa orders|Piroplasmida |
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