Description

Eleutherodactylus auriculatus is a tiny frog, with adult males measuring up to 20 mm and females to 24 mm in SVL. Digital discs are developed. There is no webbing between the toes. The vomerine teeth, behind the choanae, are present in an oblique series (Cope 1862; Bogart 1981; Ruiz 1987; Schwartz and Henderson 1985; Schwartz and Henderson 1991).

This frog is dark brown to tan or light gray, with the sides darker than the dorsum. A dark bar runs across the back and above the insertion of the forelimbs. Some individuals have a median dorsal light stripe. A brown to black line descends from the upper orbit to near the shoulder, crossing the upper part of the tympanum. The loreal region is black. A blackish band extends between the eyes. The hind limbs are dark with the concealed surfaces brownish in color. The venter is vivid yellow; the vocal sac is greenish with black dots (Cope 1862; Bogart 1981; Ruiz 1987; Schwartz and Henderson 1985; Schwartz and Henderson 1991).

Eleutherodactylus auriculatus is a member of the subgenus Eleutherodactylus) (Heinicke et al., 2007)[3930].

Synonyms include Hylodes auriculatus and Eleutherodactylus sonans (Cope 1862; Dunn 1925).

The chromosome number is 18 (Bogart 1981).