Klein's Butterflyfish Identification Guide

Key identification features

• Small, rounded, laterally compressed body up to about 13 cm
• Pale golden-brown to grayish body with subtle darker shading toward the rear flank
• Dark bar crossing the eye, edged narrowly in pale color
• Small dark spot at the base of the pectoral fin, a useful close-range mark
• Faint orange tint around the mouth
• Mostly plain, unpatterned fins compared to many other butterflyfish

Common look-alikes

• Teardrop Butterflyfish (Chaetodon unimaculatus): has one large, distinct black spot on the upper-mid body, which Klein's Butterflyfish lacks entirely.
• Pacific Double-saddle Butterflyfish (Chaetodon ulietensis): shows two clear dark saddle blotches on the back, versus Klein's more diffuse, evenly toned rear shading.

Where you'll see one

Klein's Butterflyfish is widespread across the Indo-Pacific, tolerating a broad depth range from shallow reef flats to deeper slopes and turbid coastal reefs, and is often seen alone as a hardy generalist feeder on algae, coral, and zooplankton. Its tolerance for lower water quality and variable habitat makes it one of the more adaptable and commonly sighted butterflyfish across its range.