Three prominent flat spines on opercle, the upper
smallest and terminating most anteriorly, the middle one
terminating most posteriorly, projecting dorsally at an
angle of nearly 45° with body axis, its tip closer to upper
than lower spine; opercular flap well developed and also
pointing diagonally upward; posterior margin of
preopercle with 27 serrae (29 on other side); ventral
margin of preopercle with two antrorse spines, the one
nearest angle with two serrae on its lower edge; margin
of subopercle and interopercle each with six small serrae
adjacent to their juncture; free edge of supracleithrum
with four serrae.