POLYNEMIDAE Filimanus perplexa, 11.1 cm SL (preserved specimen; photo by Ukkrit Satapoomin) Filimanus perplexa Feltes, 1991 Splendid Threadfin D VIII+I, 11, 9; A III, 13-15; P1 13-14+7 filaments; P2 I, 5; LLp 49-51; GR 47-55. Body moderately deep, strongly compressed; body depth 2.7-3.1 in SL. Snout blunt; interorbital region of frontals slightly concave. Posterior margin of maxilla extending beyond a vertical through posterior margin of adipose eyelid; depth of posterior margin of maxilla greater than eye diameter. Lip on lower jaw well-developed, dentary teeth restricted to dorsal surface; vomer with an inconspicuous tooth plate. Longest pectoral filament extending well beyond midpoint of anal-fin base (sometimes extending beyond fork of caudal fin). Lateral line simple, extending from upper end of gill opening to mid-distal margin of caudal-fin membrane. Supraneural bones 2. Swimbladder simple. Color: body and fins fawn to yellow; fins yellowish-white. Base of pectoral filaments white, becoming light brown on posterior tips; pectoral fin with scattered melanophores. Size: maximum length 16 cm SL. Distribution: known only from the Andaman Sea and eastern Indonesia. Remarks: probably occurs on muddy and sandy substrata. Taken in trawls.