Distinctive Characters: Dorsal fin with 10 spines and 15-17 rays. Anal fin with 3 spines and 7-8 rays. Pectoral rays 18-20 rays. Body depth 2.8-3.3 in standard length. Compressed and elongated body. Base of caudal and pectoral covered with scales. Colour: Dorsal pink becoming yellow on lower sides. Dorsal spines and anterior rays pinkish. Caudal fin of females deeply emarginate and lobe tips bright red and in males caudal fin lunate and red with narrow lavender upper and lower margins and a short red bar on side of the body. No violet lines above.
Habitat and Biology: Occurs on coral reefs to depths of 60 m. Feeds on zooplankton. Distribution: Indo-Pacific.
Remarks: Pseudanthias cooperi is often mis-identified as Pseudanthias taeniatus Klunzinger, a Red Sea species. P. kashiwae Tanaka, is a synonym. A popular aquarium fish.