GOBIIDAE Drombus triangularis, 4.7 cm SL (photo by Koichi Shibukawa) Drombus triangularis (Weber, 1909) Brown Drombus D VI + I, 9-10; A I, 8; P1 16-17; LR 30-31; PDS 17-19. Body moderately elongate and compressed. Head slightly depressed; lower jaw projecting beyond upper jaw; gill opening not reaching anteriorly to a vertical through preopercular margin. Pelvic fins united medially; frenum present. Scales ctenoid, excluding nape, breast, pectoral-fin base with cycloid scales; head naked, excluding posterior half of occipital area scaled. Sensory canals and pores present on head; distinct transverse pattern of sensory-papillae rows on cheek; uniserial transverse row of sensory papillae just behind chin. Color: head and body dusky with irregular mottles; yellow triangular spot at uppermost of pectoral base. Size: 5.0 cm. Distribution: Andaman Sea and West Pacific. Remarks: found in tidal estuaries, especially around rubbles in mangrove area.