At sexual maturity the size of Priacanthus hamrur reaches 18–19 cm (7.1–7.5 in) in males, 19.1–20.0 cm (7.5–7.9 in) in females, [1] but males can reach a maximum length of 45 cm.[2] The body of the Crescent-tail Bigeye is relatively deep, strongly compressed laterally. The eyes are very large and red (even in case of silver livery). The mouth is oblique with a protruding lower jaw and small conical teeth.