GOBIIDAE Favonigobius reichei, 4.8 cm SL (male; photo by Koichi Shibukawa) Favonigobius reichei, 3.6 cm SL (female; photo by Ukkrit Satapoomin) Favonigobius reichei (Bleeker, 1853) Indo-Pacific Tropical Sand Goby D VI+I, 8; A I, 8; P1 16; LR 27; PDS 3. Body moderately elongate and compressed. Head subcylindrical or slightly depressed; lower jaw slightly projecting beyond upper jaw. Gill opening not reaching anteriorly to a vertical through posterior margin of preopercle; tongue near truncate. Second spine of first dorsal fin elongate and filamentous in male; pelvic fins united medially; frenum present. Scales ctenoid, excluding breast and pectoral-fin base with cycloid scales; head naked. Sensory canals and pores present on head; sensory papillae rows on cheek multiple, but not forming distinct transverse rows; aggregation of sensory papillae just behind chin. Color: head and body pale gray with numerous black dots; ventral surface of head pale; caudal fin lacking distinct ocellated spots on upper part. Size: 8.3 cm. Distribution: Indo-West Pacific. Remarks: found in estuaries, mangroves, and shallow coastal waters with sandy-mud bottoms.