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Early juvenile markings: New recruits (10-15 mm SL) of S. planifrons have only a few discrete small and round blue spots on the head and upper body with only a single spot on the upper iris (not a stripe). There is a large black ocellus centered on the last three dorsal-fin spines and first three dorsal-fin soft rays (about 40% on the fin, 60% on the body) and a caudal-peduncle saddle made up of a pale area surrounded by dusky shading followed by a distinct black spot. Although it is a diagnostic feature for later juveniles, new recruits do not have a spot at the top of the pectoral-fin base. Ontogenetic homologies include a short-lived blue ring around the dorsal-fin ocellus and blue edging around the caudal-peduncle saddle spot.

Later juveniles (over 15 mm SL) are characterized by a uniform yellow body, a black dorsal-fin ocellus, a large black upper caudal-peduncle spot, and a prominent black spot at the pectoral-fin base.

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Source: CORALREEFFISH.COM

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