Pseudanthias pleurotaenia
The males are deep pink and orange in colour with a large quadrilateral purplish blotch on the flank , a red tip on the posterior margin of the dorsal fin , the caudal fin lobes have mauve tips and there is a reddish stripe which runs from the snout through the eye and through the base of the pectoral fin to the base of the tail . 
<triplet> dorsal fin <subj> caudal fin <obj> subclass of