Sphaerodactylus sabanus

Saba Least Gecko (Sphaerodactylus sabanus)

The Saba least gecko, scientifically known as Sphaerodactylus sabanus and also referred to as the Saba dwarf gecko, is a small lizard species native to the Lesser Antilles in the Caribbean. This gecko is found on the islands of Saba, Sint Eustatius, Saint Kitts, and Nevis, with the highest abundance noted on Sint Eustatius and Saba.

Physical Characteristics

Adult Saba least geckos are relatively small, with females reaching a snout-to-vent length of up to 28 mm and males up to 30 mm. Their coloration varies, with a background ranging from light to dark brown. Some individuals exhibit patterns, including dull orange heads and dark brown stripes extending from the nostrils towards the neck. Unpatterned individuals are a uniform brown. The throat can be yellow-tinted white, yellow, or pale orange, and the underside of the body is typically pale brown, light yellow, gray, or white. A distinctive color morph observed on Sint Eustatius features an off-white head with dark brown vermiculation, a dull yellow dorsum, and a white venter.

Habitat and Distribution

Sphaerodactylus sabanus demonstrates adaptability in its habitat preferences. It thrives in moderately moist environments such as gallery forests, palm groves, and areas with Coccoloba vegetation. However, it also inhabits less hospitable xeric environments and human settlements, often at lower population densities. The species is found across various micro-habitats, including rocks, logs, dead agave plants, leaf litter, and human debris. It generally prefers slightly higher elevations, typically found up to 500 meters, though small populations may exist at higher altitudes.

Behavior and Reproduction

Observations of Saba least geckos reveal specific courtship behaviors in males, which include staring, head bobbing, licking, and tail waving. Females, however, tend to rebuff these advances. Within the same species, females can be highly aggressive towards one another, employing head-bobbing, licking, and biting. Interestingly, females of different Sphaerodactylus species tend to ignore each other. The species reproduces by laying eggs.

Conservation Status

The Saba least gecko is currently listed as 'Least Concern' by the IUCN. This classification is attributed to its relative abundance on key islands like Sint Eustatius and Saba, a lack of identified significant threats, and a stable population. Its ability to persist on human-modified islands like Saint Kitts and Nevis suggests a degree of resilience to anthropogenic pressures. Potential threats include invasive species such as mammals and rats, though its presence is documented in some protected areas.