The cymochoid isopods (Isopoda: Flabellifera: Cymothoidae) of the eastern Pacific are presented, with descriptions, figures, ranges and comments on their host relationships. Fourteen species are treated, two of which are described as new species of Lironeca. AnUocra laevis Miers, 1877 is synonymized with A. laticauda M. Milne-Edwards, 1840. Nerocila califomica Schioedte !c Meinert, 1881 and Heriwpodus barlschi Boone, 1918, are synonymized with N. acuta Schioedte & Meinert, 1881, and two morphological forms designated. Neotypes are designated for Lironeca convexa Richardson, 1905. Expanded generic diagnoses are provided for eastern Pacific taxa. An introductory section presents a review of the world literature on die family Cymodioidae, including discussions of morphology, taxonomy, natural history, evolution, and zoogeography. Confusion regarding die genus Ichthyoxenos is discussed, and several species removed to Lironeca. A phylogeny for the family is proposed.
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