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Aromobates nocturnus is a relatively large aromobatid, with females reaching 62 mm. This frog can be identified mainly by the noxious substance that they secrete, which gives off odor similar to a skunk. This noxious odor acts as a defense against predation. Dorsally this frog is green, with yellow dots present in a straight line above the belly. The hind feet are webbed (Caldwell and Summers 2003).

This species was first described by Myers et al.(1991). Phylogenetically, it is one of the most basal members of the poison frog family Aromobatidae. Aromobates nocturnus is the only known nocturnal aromobatid (all others are diurnal), and the only known aquatic aromobatid (all others are terrestrial).


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