Cystignathus (Borborocoetus ) insularis Philippi, 1902, Supl. Batr. Chil. Descr. Hist. Fis. Polit. Chile: 89. Type(s): MNHNC according to the original publication; now lost, according to Formas and Vera, 1982, Proc. Biol. Soc. Washington, 95: 597. Type locality: "Ex insula Mocha allatus" (= Mocha Island, Chile).
Borborocoetes insularis — Philippi, 1902, Supl. Batr. Chil. Descr. Hist. Fis. Polit. Chile: 157. Nieden, 1923, Das Tierreich, 46: 397.
Eupsophus grayii insularis — Capurro-S., 1963, Invest. Zool. Chilen., 10: 10-18. by implication.
Eupsophus insularis — Formas and Vera, 1982, Proc. Biol. Soc. Washington, 95: 597.
Mocha Island Ground Frog (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 80).
Known only from the type locality (Isla Mocha, near Concepción, Chile).
Elevated from subspecies status under Eupsophus grayii (where it had so been considered by implication of Capurro-S., 1963, Invest. Zool. Chilen., 10: 10-18) and discussed by Formas and Vera, 1982, Proc. Biol. Soc. Washington, 95: 594-601. In the Eupsophus roseus group of Formas and Brieva, 1994, Proc. Biol. Soc. Washington, 107: 391-397. See map, description of geographic range and habitat, and conservation status in Stuart, Hoffmann, Chanson, Cox, Berridge, Ramani, and Young, 2008, Threatened Amph. World: 393.
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