IUCN threat status:

Least Concern (LC)

Comprehensive Description

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General Description

Body laterally compressed and deep, depth 28–30% SL, greatest near the origin of the anal fin. Head long, 29–33% SL; its depth 67–77% of its length. Dorsal profile of the back straight, upper profile of headstraight, pointing downward. Ventral side of the head concave. Snout elongate, 29–35% HL, 8.2–11.4% SL. Post-orbital distance 59–64% HL. Mouth terminal, anterior to the nostrils. Sub-mental swelling reduced. Teeth slightly notched in a single row in each jaw, 3–5 above (typically 5), 4–6 below (typically 6). Nostrils close to one another, spaced 0.33–0.65 % the diameter of the eye. Nostrils well below the level of the ventral margin of the eye. Posterior nostril 1.6–2.6times as far from the eye as the eye diameter. Eye small, 6.2–11.1% of length of the head, ringed by an unpigmented oval region of skin. Dorsal fin, 15.8–18% SL with 23–24 rays, height 14.8–16.8% SL and deeply concave. Predorsal distance 63.7–67% SL. Anal fin base length 21.8–24.5% SL with 28–31 rays, height 14.7–17.0% SL. Pectoral fin long, 17.9–21.3% SL with 12 rays. Prepectoral distance 26.4–29.5% SL. Pelvic fin length 8.1–10.5% SL; prepelvic distance 37.4–41.2% SL. Caudal peduncle length 20.1–24.8% SL, its depth 23.1–27.6% of its length. 12 circumpeduncular scales. Scales along the lateral line: 57–62. 10–12 scale rows above the lateral line, 11 below. Caudal fin deeply forked.

Preserved specimens appear dark brown above, silvery white below. A dark band runs from the tips of the longest dorsal rays to the tips of the longest anal rays. In life, specimens range from deep violet to a metalic blue color above, fading to white below the head. The longest anal and dorsal rays are dark, the more posterior anal and dorsal rays are translucent.


Creative Commons Attribution Non Commercial Share Alike 3.0 (CC BY-NC-SA 3.0)

© Hopkins, Carl D.

Source: Africhthy

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