How to Identify Purple Anthias

To identify Purple Anthias (Pseudanthias tuka), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Males are predominantly purple to magenta on the anterior body, transitioning to yellow or orange posteriorly, especially on the caudal fin and dorsal fin. A distinctive yellow stripe often runs along the dorsal fin base. Females are generally more uniformly pinkish-purple with less intense yellow. Juveniles resemble females. Coloration can vary slightly based on geographic location and mood.

Scale type

ctenoid

Mouth position

superior

Distinctive features

Elongated third dorsal spine in mature males., Lunate (crescent-shaped) caudal fin., Bright yellow stripe along the dorsal fin base (more prominent in males).

Dorsal fin

Single dorsal fin with X spines and 16-17 soft rays. The third dorsal spine is notably elongated in mature males.

Tail fin

Lunate (crescent-shaped) caudal fin.

Pectoral fin

17-18 rays, typically clear to slightly yellowish.

Distinctive fins

Pelvic fins are relatively long, often reaching the anal fin origin.

Identification Tips

1. 1

   Coloration

   Look for the distinct purple to magenta anterior body transitioning to yellow/orange posteriorly, especially in males. Females are more uniformly pinkish-purple.

2. 2

   Dorsal Fin

   Observe the third dorsal spine; it is significantly elongated in mature males, a key distinguishing feature.

3. 3

   Caudal Fin

   The deeply lunate (crescent-shaped) caudal fin is characteristic.

4. 4

   Behavior

   Often seen in large, active schools feeding in the water column above reef structures.

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