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Range DescriptionCissa thalassina is endemic to western Java, Indonesia, where there are few recent records and the species now appears to be very rare and localised (van Balen et al. 2011). Since 2001, the species has been recorded in only four protected areas: the national parks of Mt Merapi, Mts Halimun-Salak and Mts Gede-Pangrango/Megamendung, and South Parahyangan Protection Forest/Nature Reserve. In the 1990s, it was also recorded at Pembarisan Mts Protection Forest and Dieng Mts Protection Forest, with records earlier in the 20th century from Jampang Kulon (not protected), Mt Slamat Protection Forest and North Parahyangan Protection Forest/Nature Reserve (van Balen et al. 2011). The paucity of recent records implies that there are probably fewer than 250 mature individuals remaining, and the population is suspected to be in on-going decline.