What is "angel fishes"

Squamipen \Squam"i*pen\ (skw[a^]m"[i^]*p[e^]n or skw[=a]"m[i^]-), n.; pl. Squamipennes (-p[e^]n"n[=e]z). [L. squama a scale + penna a fin: cf. F. squamipenne.] (Zo["o]l.) Any one of a group of fishes having the dorsal and anal fins partially covered with scales.

Note: They are compressed and mostly, bright-colored tropical fishes, belonging to Ch[ae]todon and allied genera. Many of them are called coral fishes, and angel fishes.