Fishes from the Tirimbina Biological Reserve, La Virgen de Sarapiquí, Heredia, Costa Rica Author Angulo, Arturo Author Naranjo-Elizondo, Beatriz Author Rojas, Emmanuel Author Ley-López, Juan Manuel text Check List 2017 2017-10-27 13 5 683 702 http://dx.doi.org/10.15560/13.5.683 journal article 10.15560/13.5.683 1809-127X (12) Phallichthys amates ( Miller 1907: 108 ) ; Merry widow (En), Olomina (Sp) Figure 4A Body moderately elongate and deep, almost rhomboid, moderately compressed; lateral line reduced to a series of individual pits along side of body; fins without spines; a single dorsal fin; males with anal fin modified into a long gonopodium extending to the caudal fin origin; caudal fin rounded; general coloration yellowish gray or pale yellow (almost transparent in some specimens) with bluish or purplish highlights; in some specimens, scales bordered by black, giving a cross-hatch pattern to the body (this pattern is more intensive along the mid-line of the flanks and sometimes resembles a series of X’s along the body); females usually with prominent black or purple blotch covering base of pelvic and/or anal fins; fins usually transparent or yellowish; maximum body length ca 70 mm SL.