ABSTRACT. – Nerocila milesensis n. sp is described from the Devil firefish, Pterois miles (Bennett, 1828) (Scorpaeniformes; Scorpaenidae), a lessepsian fish, in the South Aegean Sea along the coasts of Turkey. The new species is distinguished from its two congeners native to Mediterranean, Nerocila orbignyi (Guérin-Méneville, 1832), Nerocila bivittata (Risso, 1816) and one congener native to Atlantic and Pacific Ocean, Nerocila acuminata Schiödte & Meinert, 1881 by having pereonites 5-7 mostly gradually extended to posterior than others; pereonite longest/shortest; visibility of coxae in dorsal view; proportion of pleotelson length-width; number of setae on maxilliped; number of setae on articles of mandible; number of spine on pereopod 7; endopod and exopod length of uropod.