Scientific name: 
Chaetodon lunulatus
Distinctive features: 
Pale tail base. Red anal fin. Pale with oblique purplish stripes.
to 15 cm (6 in.)

The redfin butterflyfish is orange-yellow in coloration and has purple oblique stripes. Its anal fin is reddish in color. Both the base of the anal fin and tail fin are lined with a black band.