Lutjanus endecacanthus has a moderately deep body with a pointed head which has an acute snout. The knob and incision on the
preoperculum are weakly developed. The
vomerine teeth are arranged a triangular patch and there is sometimes a rearwards extension. The dorsal fin contains 10-11 spines and 13-14 soft rays while the
anal fin has 3 spines and 8 soft rays. The long
pectoral fins extend to the level of the anus and contains 17 rays. The
caudal fin is truncate. The maximum
total length recorded for this species is . The adults are brown, darker on the back and upper flanks and paler on the lower flanks, with a silvery abdomen and brown fins. The juveniles often have 6 to 8 vertical lines of white spots on the flanks and a pair of blue lines on the cheek underneath the eye. In individuals with a standard length of have a dusky patch with white front and rear margins on the dorsal part of the
caudal peduncle and to the rear of the dorsal fin. ==Distribution and habitat==