Founf on bottoms with gravel and sand or on silt and sand bottoms, near coral reefs and rocky areas . Mouthbrooders .
Dorsal spines (total): 11; Dorsal soft rays (total): 16; Anal spines: 3; Anal soft rays: 15 - 16; Vertebrae: 28. Anterior nostril a short tube with simple cirrus on posterior rim; posterior end of maxilla of adult males produced as a thin flexible lamina that usually extends beyond posterior margin of opercle; spinous dorsal fin with black spot encircled by a very narrow white ring; dorsal fin with 5 or 6 dusky bands that extend onto dorsum; adult males with inner lining of maxilla and adjacent membranes with 2 dark stripes, one stripe in females; pectoral fin uniformly pigmented, no black speckles proximally; buccal pigmentation consisting of a dark area widely surrounding esophageal opening except for a pale area posteriorly that continues between upper pharyngeal tooth patches; caudal vertebrae 8 .: elongated.
Behavioural data for Darkfin jawfish is currently being reviewed.
Diet information for Darkfin jawfish is currently being compiled.
Employ mouthbrooding to care for their young .
Marine; demersal; depth range 15 - 69 m . Subtropical Southwest Atlantic: Brazil.
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