How to Identify Oval Butterflyfish

To identify Oval Butterflyfish (Chaetodon lunulatus), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

The body is predominantly white to pale yellow, transitioning to a brighter yellow posteriorly. It features several narrow, dark, vertical bands on the anterior half of the body, which fade towards the posterior. A prominent black bar runs vertically through the eye. The most distinctive feature is the bright orange to reddish-orange caudal fin (tail fin), often with a thin black submarginal band. The dorsal and anal fins are typically yellow with a thin black margin.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Bright orange to reddish-orange caudal fin, Black vertical bar through the eye, Laterally compressed, oval body shape, Several faint dark vertical bands on the anterior body

Dorsal fin

Single dorsal fin with 13-14 spines and 20-22 soft rays. The spiny and soft-rayed portions are continuous.

Tail fin

Truncate to slightly rounded, bright orange to reddish-orange with a potential thin black submarginal band.

Pectoral fin

Transparent to yellowish, relatively small.

Distinctive fins

Anal fin with 3 spines and 17-18 soft rays, typically yellow with a black margin. Pelvic fins are small and yellowish.

Identification Tips

1. 1

   Caudal Fin Color

   The most reliable identifier is the bright orange to reddish-orange caudal fin, which contrasts sharply with the paler body.

2. 2

   Eye Bar

   A distinct black vertical bar passing through the eye is a consistent feature among butterflyfishes, but its prominence and shape can aid in identification.

3. 3

   Body Bands

   Observe the faint, narrow, dark vertical bands on the anterior half of the body. These are less pronounced than in some other butterflyfish species.

4. 4

   Body Shape

   Its distinctly oval and laterally compressed body shape is characteristic of the genus Chaetodon.

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