Colostethus nexipus Frost, 1986, Proc. Biol. Soc. Washington, 99: 214. Holotype: BMNH 1983.1061, by original designation. Type locality: "Los Tayos, Morona-Santiago Province, Ecuador, 78° 12′ W, 3° 10′ S".
Colostethus citreicola Rivero, 1991, Caribb. J. Sci., 27: 11. Holotype: USNM 282687, by original designation. Type locality: "immediate environs of Limón (General Plaza), 3600 ft (1097 m), Provincia Azuay", Ecuador. Synonymy by Coloma, 1995, Misc. Publ. Mus. Nat. Hist. Univ. Kansas, 87: 44.
Hyloxalus nexipus — Grant, Frost, Caldwell, Gagliardo, Haddad, Kok, Means, Noonan, Schargel, and Wheeler, 2006, Bull. Am. Mus. Nat. Hist., 299: 169.
Los Tayos Rocket Frog (Colostethus nexipus: Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 49).
Limon Rocket Frog (Colostethus citericola [no longer recognized]: Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 48).
Elevations of 500-1550 m on the lower eastern slopes and foothills of the Andes from Ecuador south to Peru in the region of Yurimaguas.
See account by Coloma, 1995, Misc. Publ. Mus. Nat. Hist. Univ. Kansas, 87: 45. Duellman, 2004, Sci. Pap. Nat. Hist. Mus. Univ. Kansas, 35: 30-32, provided an account.
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