A synopsis of the species of Monocystis (Apicomplexa: Gregarinomorphea: Arthrogregarida) is presented, including a total of 114 species of worldwide. The most significant morphological and morphometric traits for each species are included together with information on the type-host, type locality, the infection site within the host and the original references. This checklist enumerates total Monocystis spp. in a place described so far in the worldwide pattern.
Keywords: Acephaline; Apicomplexa; Coelozoic; Gregarine; Parasite.
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