Beside a few fragments from mongolia and europe there is no known Monopterna species which is older than Dryonychus.
The small 1,5 m long long animal was found in 1956 in Linxia (China). The skeleton is headless and severely damaged.
It was flightable but the long legs suggest that it hunts mostly on the ground.
The describer of the holotype assume that Dryonychus stands near the origin of the Insuladraconidea and the Confucosauridae.