soft rays: 12 - 14. Body and median fins generally brown to nearly black; body paler ventrally; fins grading to smoky gray distally. Margin of scales on sides with blackish streak, appearing as series of transverse bands; few small blue spots scattered on head and sides. Pelvic and anal fins bright blue anteriorly. Morphologically similar with S. fasciolatus but S. obreptus has well-developed serrae on the suborbital and preopercle margins, posterior outline of soft dorsal more pointed and angular, and it differs in habitat. Lips dusky brown.