Ecology and colour variation of Oreophryne monticola (Anura: Microhylidae) with reference to vocalisation and predicted habitat suitability

The Lombok cross frog (Oreophryne monticola) is endemic to the islands of Bali and Lombok. We describe the colour variation and associated microhabitats of this endangered species, and provide some notes on its call characteristics and predictions of its distribution in Bali and Lombok. We surveyed sites on both islands with similar altitude but slightly differentmicrohabitats. The frogs were more likely to be found in forests dominated by dipterocarp trees, many epiphytic ferns, and ground covered with leaf litter. Possible differences in colour variation and call suggest that there may be cryptic species within O. monticola that could be resolved by morphological and molecular study. The predicted distribution suggests nine isolated areas at around 1100 m a.s.l. on both islands that may be home to this frog.