Usually observed solitary; juveniles relatively common in shallow waters (3 - 20 meters) while adults are in deeper waters (30 - 60 meters) .
Dorsal spines (total): 9; Dorsal soft rays (total): 12; Anal spines: 3; Anal soft rays: 12. Juveniles and females blue with a bright yellow region dorsally from mouth to posterior base of dorsal fin; caudal fin with a single dark spot. Adults with a broad blue stripe on upper half of body ending at the beginning of the caudal fin; lower half of body light blue; a diagonal dark band from eye to nape. Two pairs of enlarged canine teeth anteriorly in the lower jaw .: fusiform / normal.
Behavioural data for Halichoeres Dimidiatus is currently being reviewed.
Distinct pairing during breeding .
Marine; reef-associated; depth range 3 - 60 m . Tropical Southwest Atlantic: French Guiana to the State of São Paulo, Bazil.
The following diseases are known to affect Halichoeres Dimidiatus.
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