When it comes to identifying the species with the smallest radius, one of the top contenders is the Greater Sun-Tailed Gecko. This species, also known as the Sphaerodactylus argus, is a small, nocturnal gecko found in the Caribbean and Central America. It is recognizable due to its large head and a distinct “sunburst” pattern on its body.

The Greater Sun-Tailed Gecko has a maximum length of around 4 inches and a width of 0.5 inches, making it one of the smallest reptiles in the world. It’s also one of the smallest lizards when it comes to having the smallest radius. The average radius for this species is about 0.1 inches. This makes it the species with the smallest radius on record.

The Greater Sun-Tailed Gecko can also be found in a variety of habitats, such as dry shrubland, wet forest, and even coastal areas. They generally feed on insects and other small invertebrates. Even though they have small bodies, they are known to be quite active, and they can make excellent pet lizards.

In conclusion, the Greater Sun-Tailed Gecko is considered to be the species with the smallest radius on record due to its small size. Although this species is small, it is a great pet lizard due to its active nature and interesting appearance.