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Description: Based on transitional recruits, the larvae of C. eidolon may or may not have the jaw-angle or thoracic midline melanophores characteristic of other sand goby larvae. The caudal fin of transitional recruits have melanophores at the base of the central fin rays, and not at the lowest two or three segmented rays. Otherwise the larvae would look similar to other sand goby larvae: body relatively thin, long and narrow with a large eye and a terminal mouth. Pectoral fins long, dorsal and anal-fin bases relatively short, caudal peduncle long and narrow, procurrent caudal-fin rays 8-9 (7-8 spindly). Melanophores in a paired row along the anal-fin base, usually between the third and eighth element (often merged into a streak on each side). Then, after a space, there are several midline melanophores extending along the ventral caudal peduncle ending near the start of the procurrent caudal-fin rays. Internal melanophores are present at the base of the saccule and often above the saccule and sometimes several around the rear braincase, along the dorsal surface of the swim bladder, and around the gut near the vent. Transitional recruits develop a scattering of melanophores on the dorsal aspect of the head, not forming stripes. There is usually a conspicuous one or two large melanophores at 7-8 o'clock on the orbital rim and two or three oblong and comma-shaped collections of melanophores on the membrane overlying the dorsal aspect of the eyeball. The pelvic fins have not developed the short innermost fin rays and notched outline (rays equal in length). The lower portion of the head and the thorax are unmarked, as is the base of the pectoral fin. Melanophores cover the membranes of both dorsal fins and the anal fin. A bar of melanophores develops at the base of the caudal fin, concentrated at the base of the central caudal-fin rays. Fine melanophores speckle the distal portions of the lower segmented caudal-fin rays and, to a lesser extent, the central and upper rays.

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Source: CORALREEFFISH.COM

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