Levine N D
College of Veterinary Medicine, University of Illinois, Urbana 61801.
J Protozool. 1987 Nov;34(4):362-3. doi: 10.1111/j.1550-7408.1987.tb03191.x.
About 447 species of coccidia have been named from the 1687 living, known species of rodents; 207 host species, 92 host genera, and 15 host families are represented; this is about 12% of the known species of rodents. About 4600 species of apicomplexan protozoa have been named. Assuming that the same proportion of the total number of apicomplexan species has been named as of the coccidian species, there must actually be about 38,333 species of apicomplexan protozoa. There are 5.4 times as many protozoan genera as of apicomplexan genera. Assuming that the number of species in each genus is the same for all the protozoa as it is for the Apicomplexa, there may actually be 206,998 species of protozoa. This may be too conservative an estimate. Based on other criteria, an estimate of over 20 million species could be made.
在已知的1687种现存啮齿动物中，已命名的球虫约有447种；涉及207种宿主、92个宿主属和15个宿主科；这约占已知啮齿动物种类的12%。已命名的顶复门原生动物约有4600种。假设已命名的顶复门物种占其总数的比例与球虫物种相同，那么实际上顶复门原生动物约有38333种。原生动物的属是顶复门属的5.4倍。假设所有原生动物各属的物种数量与顶复门相同，那么实际上原生动物可能有206998种。这一估计可能过于保守。基于其他标准，估计可能超过2000万种。
