Taruga eques

Adult males measure 33–43 mm (1.3–1.7 in) and females 59–71 mm (2.3–2.8 in) in snout–vent length. It resembles (and has been confused with) Taruga fastigo but has relatively shorter legs, narrower but longer head, an by the absence of the black line that connects the axilla and groin in Taruga fastigo, or that line being reduced to a band of blackish dots.[3] Taruga eques can be differentiated from the species included to the same genus with the presence of Calcar on the heel.[4]

Taruga eques inhabits montane tropical moist forests at elevations of 1,200–2,135 m (3,937–7,005 ft) above sea level. It is both arboreal and terrestrial, being found in the canopy and on tree trunks as well as in grasses at the edge of ponds. The tadpoles occur in both permanent and seasonal ponds. It does not occur in modified habitats. While a common species, it is threatened by habitat loss caused by the conversion of forest to agricultural use, forestry, fires, and infrastructure development. It is present in the Horton Plains National Park, Hakgala Strict Nature Reserve, and the Peak Wilderness Sanctuary.[1]

Taruga eques (adult stage) with dark brown dorsal colouration found in world heritage Horton Plains National Park

Polymorphism is defined as “arising of two or more distinct forms simultaneously in the same habitat of a species in such proportions that the rarest of them cannot be maintained by recurrent mutation’’.[5]