Abstract
Since it was described, Cathorops multiradiatus has been differentiated from congeners through the large number of anal-fin rays ( 25 - 27). In this study, C. multiradiatus is redescribed and a new sympatric species with similar number of anal-fin rays is described and intersexual differences of both species evaluated. Cathorops manglarensis differs from C. multiradiatus by possessing few gill rakers on the first arch ( 13 - 16 vs. 16 - 19), a longer maxillary barbel (28.4 - 38.2 vs. 22.9 - 27.7% SL), longer pectoral-fin spine (18.5 - 22.5 vs. 16.9 - 18.7% SL), posterior margin of pectoral-fin spine with short and inconspicuous serrations ( vs. posterior margin of pectoral-fin spine with long and conspicuous serrations), dorsal-fin spine shorter than pectoral-fin spine ( vs. dorsal-fin spine longer than pectoral-fin spine), and large accessory tooth plates with large and numerous molariform teeth ( vs. small accessory tooth plates with small and few molariform teeth). The nominal species Tachysurus emmelane and Tachysurus equatorialis are considered junior synonyms of C. multiradiatus and a key to species of Cathorops from the Pacific coast of Central and South America is provided.References
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