GOBIIDAE Priolepis semidoliatus, 1.9 cm SL (photo by Ukkrit Satapoomin) Priolepis semidoliatus (Valenciennes, 1837) Halfbarred Goby D VI + I, 9-10; A I, 7-8; P1 16-18; LR 25-28; PDS 0. Body relatively short, compressed posteriorly. Head subcylindrical or slightly depressed; lower jaw slightly projecting anteriorly beyond upper jaw; gill opening extending slightly beyond a vertical through preopercular margin anteriorly; tongue near truncate or rounded. Spines of first dorsal fin elongate, filamentous; pelvic fins united medially; frenum (connecting membrane between pelvicfin spines) not developed. Scales on body ctenoid; head naked. Sensory canals and pores absent on head; reduced longitudinal pattern of sensory-papillae rows on cheek. Color: ground color of head and body yellowish orange to dark gray brown; several vertical or oblique pale bars on head and body, some of which connected one another at dorsum. Size: 3.0 cm SL. Distribution: Indo-West Pacific. Remarks: found beneath coral rubbles on sandy bottoms, shallow coral reefs, and tidal estuaries.