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Description and meristic analysis of eleven species of    Microcyclops    recorded in America were performed based on the examination of type specimens and fresh material. Microscopic analysis of oral appendages, such as the shape and armature of the distal coxal endite of the maxilla, the ornamentation on the caudal surface of the antenna, and the intercoxal sclerites and armament of the inner basis of all swimming appendages, were characteristics that allowed the differentiation between species. Among these species, our study confirmed the synonymy of    M.   diversus    Kiefer, 1935 with    M.   ceibaensis    (Marsh, 1919). The results of our observations showed that    M.   alius    (Kiefer, 1935) is a junior synonym of    M.   dubitabilis    Kiefer, 1934; the latter being confirmed as a valid species. Also, it is proposed that the records of    M.   rubellus    (Lilljeborg, 1901) and    M.   varicans    (Sars, 1863) in America should be revised as there are serious doubts about their distribution in America. The analysis suggested that    M.   anceps   pauxensis    Herbst, 1962 is distinct from   M.   anceps   var.   minor   Dussart, 1984 and that both are likely different from    M.   anceps   anceps    (Richard, 1897). Finally a full morphological description of adult females of    Microcyclops   inarmatus    sp. n.  is presented.

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Taxonomic evaluation of eleven species of    Microcyclops    Claus, 1893 (  Copepoda  ,   Cyclopoida  ) and description of    Microcyclops   inarmatus    sp. n. from America