Main Ref. | Gosse, J.P., E.J. Coenen and G.G. Teugels, 2003 |
Appearance refers to | |
Bones in OsteoBase |
Specialized organs | no special organs |
Different appearance | |
Different colors | |
Remarks |
Striking features | none |
Body shape lateral | elongated |
Cross section | |
Dorsal head profile | more or less straight |
Type of eyes | more or less normal |
Type of mouth/snout | more or less normal |
Position of mouth | sub-terminal/inferior |
Type of scales | ctenoid scales |
Diagnosis |
Diagnosis: body very elongate; head length 3.9-4.4x SL; scale formula 4.5-5.5/49-54/-; 7-8 scales between anus and anal-fin base; 14-16 scales around caudal peduncle; 10-12.5 scales between posterior end of adipose and caudal fin base; pectoral fins usually extend beyond pelvic-fin bases; dorsal-fin origin behind level of pelvic-fin insertions; 9-10 anal fin branched rays; 13-14 dorsal fin branched rays; 13-16 pectoral fin branched rays; 9-10 pelvic fin branched rays; fins, including adipose fin, colourless, but often dark spot at base of each caudal-fin lobe and small spot in antero-dorsal region of dorsal fin; 7-11 cross-bars present on back; 4-7 separate spots along lateral line (Ref. 2936, 86396). Description: snout rounded; body elongate and rather low; eyes in dorso-lateral position; interorbital space narrow (11.4-16.1% head length); head length 22.8-25.9% SL; 8 or 9 bicuspid teeth in upper jaw; population in Niger Delta with reduced number of scales on lateral line (45-47) (Ref. 2936, 86396). Coloration: longitudinal series of small spots often visible below lateral line in large specimens (Ref. 2936, 86396). |
Ease of Identification |
Lateral Lines | 1 Interrupted: No |
Scales on lateral line | 49 - 54 |
Pored lateral line scales | |
Scales in lateral series | |
Scale rows above lateral line | 4 - 6 |
Scale rows below lateral line | |
Scales around caudal peduncle | 14 - 16 |
Barbels | 0 |
Gill clefts (sharks/rays only) | |
Gill rakers | |
on lower limb | 8 - 10 |
on upper limb | |
total | |
Vertebrae | |
preanal | |
total |
Attributes | no striking attributes |
Fins number | 1 |
Finlets No. | Dorsal |
Ventral | |
Spines total | |
Soft-rays total | |
Adipose fin | present |
Attributes | forked; more or less normal |
Fins number | 1 |
Spines total | |
Soft-rays total |
Pectoral | Attributes more or less normal |
Spines | |
Soft-rays | |
Pelvics | Attributes more or less normal |
Position abdominal before origin of D1 | |
Spines | |
Soft-rays |