Drepanosaurus (/drəˌpænəˈsɔːrəs/; "sickle lizard") is a genus of arboreal (tree-dwelling) reptile that lived during the Triassic Period.

Megalancosaurus' skull was approximately the same size as its enlarged claws, and had a bird-like jaw and head shape.

[2] The animal's second digit bore a large claw, reminiscent of those found in dinosaurs such as Noasaurus and Baryonyx.

However, it is more likely that Drepanosaurus used its claw like the modern pygmy anteater, tearing through bark and insect nests to find invertebrate prey.

The humerus and radius were short, while the ulna was replaced by an ulnare and shifted to the elbow, taking a disc-like form.

Drepanosaurus is hypothesized to have been an insectivore, using the claws on the second digits to lift bark and dig into crevices and grooves on trees to find insects.

Most drepanosaurs are thought to be tree-dwelling insectivores with similar body structures to Drepanosaurus, except for minor differences usually dealing with forelimb configuration and head shape disparities.