Underwoodisaurus

Underwoodisaurus is a small genus of Australian geckos, commonly known with the species Uvidicolus sphyrurus as thick-tailed geckos. The species Underwoodisaurus milii is often called the thick-tailed gecko.

Underwoodisaurus
Thick-tailed gecko (Underwoodisaurus milii)
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Order:	Squamata
Family:	Carphodactylidae
Genus:	Underwoodisaurus Wermuth, 1965
Species
Two recognized species, see text.

Etymology

The generic name, Underwoodisaurus, is in honor of British herpetologist Garth Leon Underwood.[1]

Taxonomy

The genus Underwoodisaurus has a complex taxonomic history, but the currently accepted taxonomic concept follows Oliver & Bauer (2011),[2] with a second species subsequently recognised by Doughty & Oliver (2011).[3] Reptile systematists nowadays recognise a distinct family, Carphodactylidae, for this and some related genera.

Description

Adults of some species can reach a snout-to-vent length of 80mm. Preanal pores are absent. The feet are generally "bird-like" with long slender digits, and the tail is carrot-shaped. The underside of the body is white, and the dorsal surface ranges from dark purplish-black through reddish-brown to pale fawn, with small white, yellow and black spots in patterns.[4]

A thick tail is generally a sign of good health, although lack of thickness may indicate recent egg-laying.

Distribution

The genus Underwoodisaurus is endemic to Australia. These geckoes are found in a range of habitats including wet coastal heathlands, wet sclerophyll forests, arid scrubland, rocky outcrops and stony hills in eucalypt woodland.[4]

Ecology

Thick-tailed geckos shelter under leaf litter, around the bases of trees in loose bark, and in crevices.[4]

They emerge in the evenings to hunt in open areas[4] for crickets, cockroaches and huntsman spiders. They eat once every 3–4 days. When they see prey they will stare at it and wag their tails, then pounce. When alarmed, the thick-tailed gecko will make a barking sound or hiss. They will also raise their backs. One main predator is snakes.

Reproduction

Thick-tailed geckos lay up to 2 eggs and up to 10 clutches per year. The first clutch of eggs is usually infertile. When the female is gravid the eggs are visible through the skin. The eggs take about 65 days to hatch. Their breeding season is roughly July to February.

Species of genus Underwoodisaurus

• Underwoodisaurus milii (Bory de Saint-Vincent, 1825) – thick-tailed gecko
• Underwoodisaurus seorsus Doughty & P. Oliver, 2011[3]

Nota bene: A binomial authority in parentheses indicates that the species was originally described in a genus other than Underwoodisaurus. The species Uvidicolus sphyrurus is sometimes placed in the genus Underwoodisaurus.

References

1. Beolens, Bo; Watkins, Michael; Grayson, Michael (2011). The Eponym Dictionary of Reptiles. Baltimore: Johns Hopkins University Press. xiii + 296 pp. ISBN 978-1-4214-0135-5. (Underwoodisaurus, p. 270).
2. Oliver, Paul M.; Bauer, Aaron M. (June 2011). "Systematics and evolution of the Australian knob-tail geckos (Nephrurus, Carphodactylidae, Gekkota): Plesiomorphic grades and biome shifts through the Miocene". Molecular Phylogenetics and Evolution. Elsevier. 59 (3): 664–674. doi:10.1016/j.ympev.2011.03.018. PMID 21421065.
3. Doughty, Paul; Oliver, Paul M. (31 August 2011), "A new species of Underwoodisaurus (Squamata: Gekkota: Carphodactylidae) from the Pilbara region of Western Australia" (PDF), Zootaxa, 30 (10): 20–30, retrieved April 3, 2012
4. Cogger, Harold G. (1994). Reptiles and Amphibians of Australia (5th ed.). Australia: Reed. pp. 275–276. ISBN 978-0730100881.

Further reading

• Wermuth H (1965). "Liste der rezenten Amphibien und Reptilian, Gekkonidae, Pygopodidae, Xantusiidae ". Das Tierreich 80: 1-246. (Uderwoodisaurus, new genus). (in German).