Coryphophylax  Coryphophylax is an agamid genus endemic to the Andaman and Nicobar Islands and a sister of the Southeast Asian "Aphaniotis". Found in tropical wet forests, they are common in suitable habitats and shows variations across islands and are sexually dimorphic. The genus is absent on Great Nicobar Island, with its southern most occurrence on the Island of Kondul. The Tsunami of December 2004 may have affected island wise distributions in the Nicobar Islands of several species and also their gene-flow. The species from the Andaman Islands was described by Edward Blyth as "Tiaris subcristata" in 1860 but technically published in 1861. This species was described by Fitzinger in Steindachner's publication of 1867 and as "Tiaris humei" by Stoliczka in 1873 and these names are considered junior synonyms but placed in the genus erected by Fitzinger. The closely related genus "Aphaniotis" (and the more distant "Otocryptis") has a concealed tympanum while "Gonocephalus" has spines on the head or nape.