Pseudoeurycea mystax Bogert, 1967, Am. Mus. Novit., 2314: 12. Holotype: AMNH 76363, by original designation. Type locality: "0.9 kilometer east-northeast of Ayutla, Oaxaca, in the Distrito de Villa Alta", Mexico.
Mustache False Brook Salamander (Liner, 1994, Herpetol. Circ., 23: 14; Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 33).
Mustached False Brook Salamander (Liner and Casas-Andreu, 2008, Herpetol. Circ., 38: 33).
Known only from the type locality near Ayutla, Oaxaca, Mexico, 2100 m elevation, in pine-oak woodland.
In the Pseudoeurycea leprosa group of Lara-Góngora, 2003, Bull. Maryland Herpetol. Soc., 39: 21-52. Raffaëlli, 2007, Les Urodèles du Monde: 206-207, provided a brief account, photograph, and map. See map, description of geographic range and habitat, and conservation status in Stuart, Hoffmann, Chanson, Cox, Berridge, Ramani, and Young, 2008, Threatened Amph. World: 589.
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