Xenophallus umbratilis ( Meek 1912: 390 )

Angulo, Arturo, Naranjo-Elizondo, Beatriz, Rojas, Emmanuel & Ley-López, Juan Manuel, 2017, Fishes from the Tirimbina Biological Reserve, La Virgen de Sarapiquí, Heredia, Costa Rica, Check List 13 (5), pp. 683-702 : 691

(15) Xenophallus umbratilis ( Meek 1912: 390) ; Live- bearer (En), Olomina (Sp)

Figure 4D

Body elongate and moderately deep; 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 beyond the dorsal fin insertion; gonopodium asymmetric, either dextral or sinistral; caudal fin rounded; general coloration grayish yellow, darker dorsally, usually brownish yellow, and paler, usually yellowish white or almost white ventrally; juveniles and adult males with 5–10 black bars on the flanks; fins usually transparent or yellowish, the dor- sal fin have the first ray black and a wedge-shaped black base, usually with a dusky posterior margin (in males, the remaining fin is usually brilliant yellow); maximum body length ca 45 mm SL.