How to Identify Redhead Wrasse

To identify Redhead Wrasse (Halichoeres rubricephalus), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Initial phase (IP) individuals (females and juvenile males) typically have a greenish-brown body with several horizontal rows of small, dark spots or dashes, and a pale belly. The head may show some reddish or orange hues, especially dorsally. Terminal phase (TP) males are strikingly different: the head is bright red to reddish-orange, sharply demarcated from the body. The body is generally green to bluish-green, often with a prominent dark spot on the operculum and sometimes a dark bar behind the pectoral fin. The fins are typically yellowish to reddish.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Bright red head in terminal phase males, sharply contrasting with the green body., Dark spot on the operculum (gill cover) in terminal phase males., Elongated body shape typical of Halichoeres wrasses., Small, dark spots or dashes in horizontal rows on the body of initial phase individuals.

Dorsal fin

Single, long dorsal fin with 9 spines and 11 soft rays. The spinous and soft-rayed portions are continuous.

Tail fin

Truncate to slightly rounded caudal fin.

Pectoral fin

Rounded pectoral fins.

Distinctive fins

Pelvic fins are relatively small. All fins are generally proportionate to the body.

Identification Tips

1. 1

   Terminal Phase Male Coloration

   Look for the unmistakable bright red or reddish-orange head that sharply contrasts with the green or bluish-green body. A dark spot on the operculum is also a key identifier.

2. 2

   Initial Phase Coloration

   Initial phase individuals (females and juveniles) are more subdued, with a greenish-brown body and horizontal rows of small dark spots or dashes. The head may have some reddish wash, but not the intense, solid red of the terminal male.

3. 3

   Body Shape

   Like other Halichoeres wrasses, they have a relatively slender, elongated body.

4. 4

   Behavior

   Observe their active foraging behavior over sandy and rubble substrates, often darting in and out of crevices.

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