P. radiata grows to a length of about 24 cm (9 in), though a more usual size is 20 cm (8 in). The dorsal fin has 12 or 13 long, venomous spines and 10 to 12 soft rays. The anal fin has three spines and five or six soft rays. The large pectoral fins flare out to the side and are clear and unbanded. The other fins are also colourless. The head and body colour is reddish-brown with about six vertical dark bands of different colour on the body separated by thin white lines. Two white horizontal lines occur on the caudal peduncle which distinguishes this fish from other similar lionfishes.
This page contains all information about Radiata Lionfish.