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Description

With a total length that usually falls between 80 and 100mm, this is the smallest of the Euproctus species. The head is longer than broad, flattened and with a rounded snout. The tail is low and oval in cross section. The tail is longer than the snout-vent length in males, shorter in females. Parotoid glands are clearly distinguishable. The skin is granular in the terrestrial phase, and smooth in the aquatic phase. Color is highly variable. The dorsal side is usually a dark brown, but dark green, golden yellow, bronze, bright green marmorated and silver gray patterns also occur, together with highly variable spot patterns. A yellow to orange middorsal line is usually brighter in juveniles and subadults. A middorsal furrow is usually clearest on the back of the head. There is a clear sexual dimorphism in E. montanus. Males possess spurs on the thighs of the hind legs. The cloaca in males resembles a conical protuberance that projects backward and contains a pseudopenis that probably facilitates the direct transfer of reduced spermatophores into the female cloaca (Brizzi et al 1995). The cloaca in females opens ventrally. E. montanus can be distinguished from E. asper by the absence of lungs, the smoother skin and the lack of a skin fold on the throat. It can be distinguished from E. platycephalus by the presence of parotoid glands (Boehme et al 1999).

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