[1][6] Beddomixalus differs from the other rhacophorid genera by being a slender and elongated medium-sized frog, the female measuring up to 6.1 centimetres (2.4 in) in length; its yellowish-buff or reddish-brown dorsum carrying two distinct yellowish-cream longitudinal stripes; vomerine teeth and an absent lingual papilla; distinct supratympanic fold as well as tympanum; a rounded canthus rostralis; an obtusely concave loreal region; a simple and tubular Wolffian duct.

At the same time, the early development of non-pigmented eggs occur exposed on moist swamp beds, without protection nor parental care; it has free-living aquatic tadpoles which are adapted to lentic conditions; and the genus inhabits mid- to high elevation forests.

It possesses two light-coloured, yellowish-cream longitudinal stripes extending along its dorsolateral region, on either side of its body, which are bordered on the lower side by black dots; a broad dark band extends from below the snout along the tympanum as well, up to the middle of the animal's flank, where it morphs into a pale patch covered in vermiculations.

[1] It has a reddish- to orange-brown dorsum with similar dark and light bands and vermiculations as in the male, while its ventral surface is white.

Its eyes are bright red and its body pigmentation is a greenish-yellow by stage 44, whilst metamorphs begin emerging on land.

Most males rest on shrubs and bushes up to a height of about 2 metres (6.6 ft) and make a pulsating breeding chorus in unison.