Cepola schlegelii is an elongatedfish with the rearmost soft rays of both the elongated dorsal and anal fins connected to its lanceolate caudal fin by a membrane to form a continuous fin. The dorsal fin has 68-70 soft rays while the anal fin has 60-64. The pectoral fin has 19 fin rays There are no spines on the edge of the preoperculum and the cheeks are scaleless. This species attains a maximum total length of. The main colour of the body is red, with a black spot in the membranes of the jaw. The cheek, operculum and fin bases are whitish.