This species is named after John Edward Gray (1800-1875), a taxonomist at the British Museum who described a number of New Zealand lizards; the name 'Northland green gecko' refers to the known distribution of the species. From 1843 to 1885 primarily known as Naultinus grayi, however from 1885-1980 the species was treated as a synonym of N. elegans until Robb and Hitchmough (1980) resurrected the name for the green geckos of Northland.
This species does not co-exist with other members of Naultinus.
North Island + tongue red + gums deep blue.
A medium to large gecko (75-95 mm SVL, up to 200 mm total length, Robb and Hitchmough 1980, Jewell 2008). Dorsal surface vivid bright green. Head, body and tail marked with rows of bright grey, white or yellow spots or blotches, or continuous stripes, which are often edged with a narrow to broad outline of gold, dark green or black. Ventral sufaces pale green or yellow-green. Sexually dichromatic in males having blue flanks. Mouth lining blue, tongue tongue orange, or red. Lips and mouth with orange markings. Eye light orange-brown. Scales on upper surface of snout enlarged, flat and pentagonal in shape which contrast with dome-shaped scales as in the other North Island Naultinus spp. Toes narrow and tapering without expanded pads. Soles of feet grey-green. Tail slender; prehensile; seldom shed (Hitchmough 1997, Jewell 2008).
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