GOBIIDAE Valenciennea sexguttata, 9.7 cm SL (photo by Ukkrit Satapoomin) Valenciennea sexguttata (photo by Mark Strickland) Valenciennea sexguttata (Broussonet, 1782) Bluetrreak Goby D VI + I, 17-19; A I, 16-19; P1 20-23; LR 101-126; PDS 0. Body moderately elongate, compressed. Head subcylindrical; lower jaw not projecting anteriorly beyond upper jaw; gill opening relatively narrow, restricted to pectoral-fin base. Middle some spines of first dorsal fin elongate and filamentous, forming pointed fin; pelvic fins separated; frenum absent; caudal fin rounded. Scales small ctenoid, excepting those on belly, prepelvic region and pectoral-fin base, if present, cycloid; head naked. Sensory canals and pores present on head; longitudinal pattern of sensory-papillae rows on cheek. Color: body pale gray or pale beige; head largely yellow, with a narrow bright blue oblique stripe through cheek and operculum. Size: 10.0 cm SL. Distribution: Indo Pacific. Remarks: found on flat sandy bottoms with rubbles in shallow coral reefs.