The megrim is a relatively narrow-bodied left-eyed flatfish with a moderately large head and large eyes and mouth. The lower eye is slightly forward of the upper eye and the lower jaw is forward of the upper jaw. The background colour is usually a pale yellowish-brown with darker dusky patches. The underside is white. Adult fish can grow to 60cm in length although most are between 35-45cm. This species is similar to the four-spot megrim (Lepidorhombus boscii), however in this species the eyes are level with one another and there are two black spots on the end of both the dorsal and anal fins.