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 from its snout to its vent, and is nearly as small as a U.S. dime. At most, it weighs . 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.
