Virgin Islands dwarf sphaero

Virgin Islands dwarf sphaero
Conservation status
Endangered  (IUCN 3.1)[1]
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Order:	Squamata
Family:	Sphaerodactylidae
Genus:	Sphaerodactylus
Species:	S. parthenopion
Binomial name
Sphaerodactylus parthenopion Thomas, 1965[2]
General distribution of Sphaerodactylus parthenopion[2]

The British Virgin Islands dwarf sphaero, Virgin Gorda least gecko, or Virgin Islands dwarf gecko (Sphaerodactylus parthenopion) is a species of gecko and also one of the smallest terrestrial vertebrates. It has only been found on three of the British Virgin Islands: Virgin Gorda, Tortola, and Moskito Island (also spelled “Mosquito Island”). It was discovered in 1964 and is suspected to be a close relative of Sphaerodactylus nicholsi, a dwarf sphaero from the nearby island of Puerto Rico. It shares its range with the big-scaled least gecko (S. macrolepis), which is found in leaf litter. Unlike this larger gecko, the Virgin Islands dwarf sphaero lives on drier hillsides, yet prefers moist microhabitats found under rocks because it lacks the adaptations necessary for preventing water loss, which is a significant problem due to its small body size.

The Virgin Islands dwarf sphaero has a deep brown colour on its upper side, often with a speckling of darker scales. On average, it measures 18 mm (0.71 in) from its snout to its vent, and is nearly as small as a U.S. dime. At most, it weighs 0.15 g (0.0053 oz). There are several stripes or bars of lighter colouration behind the eyes and at the top of the neck that help distinguish it. There are no differences in colouration between males and females, although females are slightly larger in size. Its tail will regenerate when broken off. Little is known about its population size or its biology.