Enlarged spinose scales are also present across the lateral surface, unevenly distributed amongst regular keeled scales. The Water Dragon can be identified by a distinctively deep angular head and nuchal crest of spinose scales that joins the vertebral crest extending down the length of its body to the tail. In 2012 the species was officially renamed Intellagama lesueurii. cocincinus, a new genus hand to be created for the Australian Water Dragons. A recent taxonomic review concluded that the Australian species of Physignathus shows enough differing characteristics to classify it in its own genus, since Physignathus was first assigned to P. There are two recognised subspecies of Water Dragon the Eastern Water Dragon, Physignathus lesueurii lesueurii and the Gippsland Water Dragon, Physignathus lesueurii howittii. The specific name lesueurii honours the French naturalist Charles-Alexandre Lesueur (1778-1846) who collected this species on the Baudin expedition of 1800. Physignathus comprises two recognised species Physignathus lesueurii and Physignathus concincinus. The name Physignathus translates to "puff-cheek" and refers to the bulging appearance of the throat and lower jaw. The genus Physignathus was described by George Cuvier (1769-1832) in 1829 based on the type specimen of the genus the Green Water Dragon, Physignathus cocincinus of south-east Asia. The Water Dragon is Australia's largest dragon lizard and can be found living along healthy waterways in Sydney.
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