Colostethus sordidatus Duellman, 2004, Sci. Pap. Nat. Hist. Mus. Univ. Kansas, 35: 35. Holotype: KU 211960, by original designation. Type locality: "30 km SW of Zapatero (about 10 km NE San José de Sisa (ca. 05° 45′ S, 76° 33′ W), 500 m, Provincia de Lamas, Departamento de San Martín, Peru".
Hyloxalus sordidatus — Grant, Frost, Caldwell, Gagliardo, Haddad, Kok, Means, Noonan, Schargel, and Wheeler, 2006, Bull. Am. Mus. Nat. Hist., 299: 169.
None noted.
Known only from the type locality at an elevation of 500 m near the eastern base of the Cordillera Central and from an elevation of 520 m southwest of Chiriaco near the northern end of the Cordillera Central, Peru.
In the Hyloxalus bocagei clade of Páez-Vacas, Coloma, and Santos, 2010, Zootaxa, 2711: 62.
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