Hemisphaeriodon
| Hemisphaeriodon | |
|---|---|
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Order: | Squamata |
| Family: | Scincidae |
| Genus: |
Hemisphaeriodon W. Peters, 1867 |
| Species: | H. gerrardii |
| Binomial name | |
|
Hemisphaeriodon gerrardii (Gray, 1845) |
|
| Synonyms | |
Hemisphaeriodon is a genus of lizards containing only one species, Hemisphaeriodon gerrardii, the pink-tongued skink. The genus Hemisphaeriodon is closely related to the genus Cyclodomorphus, which contains some of the largest members of the skink family (Scincidae). In Australia H. gerrardii is called commonly the pink-tongued lizard. As suggested by these common names, its distinguishing characteristic is a pink tongue as opposed to the blue tongue of the closely related genus Tiliqua.
The specific name, gerrardii, is in honor of British herpetologist Edward Gerrard (1810-1910), who was Gray's "right-hand man" at the British Museum.
Commonly known as a "pink-tongued skink", it is a relatively large lizard of up to 45 cm that has a slender body with a long, slender and slightly prehensile tail about the same length as the body. The limbs are well developed with long digits and sharp claws. The neck is well pronounced and the head is relatively large, wider in males than in females. In adults the tongue is pink. H. gerrardii has a slate-grey to fawn dorsal ground colour with dark grey to brown or black cross bands. These bands are more pronounced in males and less so in females. There are about 20 cross bands from the neck to the tip of the tail, which run slightly backwards laterally. The ventral surfaces of H. gerrardii are white to pinkish or creamy brown and may be marbled on the cross bands. The scales are smooth and, on the head, edged with a darker colour. The tip of the snout is dark in adults with some darker spots on the head. The limbs are spotted or streaked darkly. All juveniles are marked with pronounced black cross bands on a very light grey ground colour. There are several dark spots on their heads, especially under the eyes. The tip of the snout is light in colour and the tongue and mouth are blue. Similar species (Cogger 2000): H. gerrardii has been associated with the genus Tiliqua as well as the genus Cyclodomorphus due to their close relation (previous names: Cyclodomorphus gerrardii and Tiliqua gerrardii). H. gerrardii is very similar in appearance to the Eastern blue-tongue, Tiliqua scincoides; however, H. gerrardii has, true to its common name, a pink tongue as an adult. It is also much more slender than the T. scincoides, having a more slender body, a much longer and narrower tail as well as a smaller head. In addition, the limbs are more developed and longer than those of the blue-tongues. Hemisphaeriodon gerrardii can be distinguished from Cyclodomorphus spp.. by its relatively shorter body, longer limbs and a much broader head.
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