This species is known only from the Serra do Mar at 800-1,200m asl in south-eastern Brazil in the states of Rio de Janeiro and extreme eastern São Paulo. Records from Parana State are incorrect, and records from Argentina have been assigned to Hyla semiguttata.
Habitat and Ecology
This frog is a species of primary and secondary forest, where the adults live in bromeliads, either epiphytic on trees or growing above or near the beds of swift, torrential brooks and streams. The larval stage lives in pools and basins in fast-flowing mountain streams and brooks, with stones or boulders in the stream-bed, surrounded by very turbulent water.
Bokermannohyla claresignata has not been recorded for 25 years, and extensive searches in recent years for this species in Rio de Janeiro have failed to locate it. The lack of records from São Paulo might be attributable to a lack of surveys. Difficulties in locating individuals might also be attributable to the species' preference for epiphytic bromeliads in tall, slender trees.
This species appears to have disappeared from areas of apparently suitable habitat, and so the threats that it faces are not well understood. The apparent decline where suitable habitat remains is reminiscent of dramatic declines and disappearances in other montane stream-breeding frogs in the wet tropics, and chytridiomycosis cannot be ruled out as the cause of this.
The only known localities of this species are in protected areas: Parque Nacional da Serra dos Orgãos, and Parque Nacional da Serra da Bocaina. However, it cannot now be located in these areas. Urgent surveys are needed to determine whether or not this species still survives.
This species was previously within the genus Hyla but has recently been moved to the genus Bokermannohyla (Faivovich et al. 2005).
Sergio Potsch de Carvalho-e-Silva, Ulisses Caramaschi 2004. Bokermannohyla claresignata. In: IUCN 2014