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Description: Body thin, long and somewhat narrow with a large eye and a terminal mouth. Pectoral fins fins long, pelvic fins form an obvious short cup (a protruding frenum) extending less than halfway to the vent. Dorsal and anal-fin bases relatively short, caudal peduncle relatively long and narrow. Lightly marked along the lower body: melanophores along the ventral midline at the pelvic-fin insertion (rarely also at the isthmus), along the anal-fin base (paired, one per side) and extending along the ventral peduncle ending well before the start of the procurrent caudal-fin rays. Internal melanophores at the dorsal surface of the swim bladder.