PTERELEOTRIDAE Parioglossus formosus, 2.5 cm SL (photo by Ukkrit Satapoomin) Parioglossus formosus (Smith, 1931) Beautiful Hover Goby D V-VI + I, 13-15; A I, 13-15; P1 15-17; LR 66-78; PDS 0. Body elongate, compressed. Head compressed; lower jaws lightly projecting anteriorly beyond upper jaw; gill opening relatively narrow, not extending anteriorly to a vertical line through middle of operculum. Middle some spine of first dorsal fin slightly elongate in male, whereas no elongate spines in female; pelvic fins separated; caudal fin near truncate or emarginate, with slightly elongate dorsal and ventral lobes in male. Scales on body small cycloid, embedded and nonimbricate; head naked. Sensory canals and pores present on head; reduced transverse pattern of sensory-papillae rows on cheek. Color: head and body pale beige, with a longitudinal black stripe from snout to posterior margin of caudal fin through eye and ventral half of body; additional black stripe along dorsal profile from snout to base of caudal fin, continuous to dark brown stripe on dorsal part of caudal fin. Size: 3.5 cm SL. Distribution: Andaman Sea and West Pacific. Remarks: found in shallow coastal area of coral or rocky reefs at high-tide hour; free swimming species, usually forming aggregations.