Morphology Data of Nannocharax ansorgii
Identification keys
Abnormalities
Main Ref. Gosse, J.P., E.J. Coenen and G.G. Teugels, 2003
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs no special organs
Different appearance
Different colors different colors in juveniles and adults
Remarks In juveniles band composed of series small, rounded spots (Ref. 2936, 86396).

Descriptive characteristics of juvenile and adult

Striking features none
Body shape lateral elongated
Cross section compressed
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 terminal
Type of scales ctenoid scales
Diagnosis

Diagnosis: snout and anal fin short; head length 22.9-31.8% SL; scale formula 5-6/42-45/-; 13-16 scales around caudal peduncle; 1.5-3 scales between anus and anal-fin origin; development lateral line variable with geographical region; pectoral fins not reaching to pelvic-fin bases; dorsal-fin origin distinctly ahead of pelvic-fin insertions; 8-12 anal fin branched rays; 11-14 dorsal fin branched rays; 10-13 pectoral fin branched rays; 8-10 pelvic fin branched rays; back usually uniformly brown (sometimes with cross-bars); dark band covering mid-lateral series of scales, and extending unto central caudal-fin rays (Ref. 2936, 86396).

Description: snout pointed; relatively short and compressed body; upper jaw with 10-14 bicuspid teeth; progressive decrease (from 16 to 13) in number of scales around caudal peduncle from west towards east; lateral line complete or almost complete in Gambia, Guinea Bissau and Sierra Leone (37-45 lateral line scales, 42-45 lateral stripe), but incomplete in Senegal, Niger-Bénoué, Chad, Bandama, Comoe, Volta and Pra (12-44 lateral line scales, 39-45 lateral stripe) (Ref. 2936, 86396).

Coloration: brown lateral stripe from snout to caudal fin base; in juveniles band composed of series small, rounded spots; yellow body, uniformly brown back (sometimes with about ten cross-bars), pink fins; dorsal fin sometimes marked with 2 or 3 transverse stripes (Ref. 2936, 86396).

Ease of Identification

Meristic characteristics of Nannocharax ansorgii

Lateral Lines 1 Interrupted: No
Scales on lateral line
Pored lateral line scales
Scales in lateral series 42 - 45
Scale rows above lateral line 5 - 6
Scale rows below lateral line
Scales around caudal peduncle 13 - 16
Barbels 0
Gill clefts (sharks/rays only)
Gill rakers
on lower limb 7 - 10
on upper limb
total
Vertebrae
preanal
total

Fins

Dorsal fin(s)

Attributes no striking attributes
Fins number 1
Finlets No. Dorsal   
Ventral  
Spines total
Soft-rays total
Adipose fin present

Caudal fin

Attributes forked; more or less normal

Anal fin(s)

Fins number 1
Spines total
Soft-rays total

Paired fins

Pectoral Attributes  more or less normal
Spines     
Soft-rays   
Pelvics Attributes  more or less normal
Position    abdominal  behind origin of D1
Spines     
Soft-rays   
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