Blue-tongued skinks can be broadly categorised as follows:
- Eastern Bluetongue Stonetongue: the most common and most common species, with 7-8 diagonal stripes on the back, most with black stripes behind the eyes, a few lighter, and relatively clean and un-patterned forelegs, with a large population in the wild, distributed in eastern and south-eastern Australia. Its other subspecies, the giant eastern bluetongue, can reach 50-60 cm in length.
- Western Bluetongue Stonetongue: body colour is teal and covered with 4-6 broad stripes, with black stripes behind the eyes, distributed in dry areas of western Australia.
- Northern bluetongue skink: much like the eastern bluetongue, with slanted dorsal stripes and no black stripe behind the eye, there are also several subspecies according to different regions.
- Northern subspecies from darwin;
- Northern subspecies from kununurra;
- Northern subspecies from princeregent.
- Central bluetongue skink: body colour grey and white with multiple orange fine lines covering it, black stripes behind the eyes, head shape is triangular, tail is short, body size is much fatter compared to other species of bluetongue, they don’t like to move much. Distributed in the desert and semi-desert areas of central and southern Australia.
- Spotted Bluetongue Stonetongue: has vertical spots on the body and a tail covered with horizontal stripes. Distributed in southeastern Australia and on the Tasmanian Islands. Divided into two subspecies, the common and alpine species. The body colour of the common species is greyish, while the alpine species is more vibrant. Usually the price of spotted blue tongue of the alpine species in Australia is several times higher than that of the common species.
- Indonesian Bluetongue: Found in Indonesia and New Guinea, this is the only species of Bluetongue to be found outside of Australia, and due to Australia’s ban on the export of their species, this Bluetongue has become the more common Bluetongue in the pet market outside of Australia. They resemble the Northern Bluetongue in that they are covered in black slashes, have no black spots behind the eyes, are relatively large, and their black limbs are their distinctive feature.
- Irian Bluetongue Stonetongue: the English name is irianjaya, which is the name of a region in Indonesia, close to New Guinea. The locally produced bluetongue is between the eastern Australian bluetongue and the Indonesian bluetongue, with a conservation level of non-cites appendix species.
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