Diagonal butterflyfish
[4] They have also been observed feeding on gelatinous zooplankton, such as jellyfish (Scyphozoa) and comb jellies (Ctenophora).[5] The diagonal butterflyfish was first formally described in 1775 by the Swedish speaking Finnish born naturalist Peter Forsskål (1732-1763) with the type locality given as Jeddah.In this group, its closest relative is probably the very similar common raccoon butterflyfish (C. lunula).Although the coloration of this group varies quite a lot, they are all largish butterflyfishes with an oval outline, and most have a pattern of ascending oblique stripes on the flanks.Except in the red-tailed butterflyfish, there is at least a vestigial form of the "raccoon" mask, with a white space between the dark crown and eye areas.