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The species of the subgenus Phrator Semenov, 1922 are reviewed, with six species now recognized. One species is downgraded to subspecies: O. multiguttatum depressum Klug, 1853 stat. nov. Some new synonymies are proposed Omophron variegatum boiteli Alluaud, 1935 syn. n. = Omophron variegatum sardoum Reitter, 1907 syn. n. = Omophron variegatum seurati Alluaud, 1935 syn. n. = Omophron (Phrator) variegatum Olivier, 1812; Omophron (Phrator) ethiopiensis Valainis, 2016 syn. nov. = O. multiguttatum (s.str) Chaudoir, 1850; and Omophron (Phrator) alluaudi Dupuis, 1913 syn. n. = O. vittulatum Fairmaire, 1894. The variability of all the treated species is discussed. A key to the species, together with new distributional data, maps of distribution, illustrations of the habitus and of the most important features are provided.
ANICHTCHENKO et al. (Thu,) studied this question.
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