GOBIIDAE Istigobius diadema, NSMT-P 66028, 8.0 cm SL Istigobius diadema (Steindachner, 1876) Eyeline goby D VI - I, 11; A I, 9; P1 19; LR 31 - 33; PDS 18. Body moderately elongate, compressed posteriorly. Head slightly depressed; snout and upper jaw projecting beyond lower jaw; gill opening not extending anteriorly to a vertical through preopercular margin. Pelvic fins united medially. Scales ctenoid, excepting operculum, occipital region, breast and pectoral fin base with cycloid; other part of head naked. Sensory canals and pores present on head; longitudinal pattern of sensory-papillae rows on cheek; a pair of short sensory papillae just behind chin. Color: head and body pale grayish brown, with a distinct horizontal black band behind eye. Size: 10.0 cm SL. Distribution: eastern Indian Ocean, Andaman Sea and Indonesia. Remarks: found in mangrove areas and bays with sandy or muddy bottoms.