Body depth contained 2.5 to 2.9 times in standard length. Head length contained 2.1 to 2.3 times in standard length; preopercle rounded, the posterior edge finely serrate, the lower edge fleshy; upper edge of operculum very convex; maxilla extends past eye; teeth noticeably large. Gill rakers 8 to 9 on upper limb and 16 to 19 on lower limb. Dorsal fin with IX spines and 14 rays; anal fin with III spines and 8 rays; pectoral-fin rays 15 or 16; pelvic-fin length contained 2.3 to 2.45 times in head length. Midlateral-body scales ctenoid; lateral-line scales 46 to 49; lateral-scale series 82 to 99.
Colour: Reddish, the edges of dorsal body scales dark brown; snout dark brown; postorbital head with pale blue network; pale blue line along rear edge of orbit; upper jaw and cheeks with scattered pale blue dots and short lines; fins reddish; margin of soft-dorsal, anal, and caudal fins pale bluish.

Papua New Guinea, Indonesia (Sulawesi, Flores), and the Philippines.

C. aitha has been found in protected or silty reef areas at depths of 5 to 33 m.

Attains 14 cm standard length.