High Quality Content by WIKIPEDIA articles! Litoria is a genus of Hylidae tree frogs native to Australia, the Bismarck Archipelago, the Solomon Islands, New Guinea, the Lesser Sunda Islands, the Moluccan Islands, and Timor. They are sometimes collectively referred to as Australasian treefrogs. They are distinguishable from other tree frogs by the presence of horizontal irises, no pigmentation of the eyelid and their Wallacean distribution. There are (as of mid-2008) almost 150 species, but as several new species are described every year on average, by 2010 the number of known species is likely to exceed 150.