Morphology Data of Nannopetersius ansorgii
Identification keys
Main Ref. Paugy, D. and S.A. Schaefer, 2007
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs no special organs
Different appearance always different morphology between mature adults
Different colors
Remarks Males tend to have elongate, filamentous dorsal and anal fins (Ref. 80290).

Descriptive characteristics of juvenile and adult

Striking features none
Body shape lateral fusiform / normal
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 terminal
Type of scales

Diagnosis: 14-17 gill rakers on lower limb of first arch; flanks with lateral pigment band, more or less restricted to posterior third of trunk and caudal fin base, extending onto median caudal fin rays; dorsal and ventral caudal fin lobes not pigmented (Ref. 80290).

Description: body relatively robust, body depth 35-40% of SL and head length 25-28% of SL; mouth terminal to slightly superior, lower jaw prominent, its depth about 1.5x that of upper jaw; premaxilla with 2 teeth in outer row each bearing 3-5 cusps, 4 teeth in inner row each bearing 5-7 cusps; dentary with 4 teeth in outer row each bearing 5-7 cusps, a monocuspid inner dentary tooth present posterior to outer row teeth; lateral line canal complete, 32-35 tubes, ultimate canal-bearing scale contacting caudal fin rays by 1-2 non-canal-bearing scales; anal fin with 3 unbranched and 19-22 branched rays (Ref. 80290).

Coloration: flanks silvery, with dark lateral pigment band more or less restricted to posterior third of trunk and caudal fin base, extending onto median caudal fin rays; band especially prominent at caudal fin base and on medial fin rays, yielding a strong diamond-shaped mark; dark humeral spot present; opercle with dark diffuse pigment; fins generally yellowish to dusky, margins trimmed in dark pigment (Ref. 80290).

Ease of Identification

Meristic characteristics of Nannopetersius ansorgii

Lateral Lines 1 Interrupted: No
Scales on lateral line 30 - 35
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line 6.5 - 6.5
Scale rows below lateral line
Scales around caudal peduncle
Barbels 0
Gill clefts (sharks/rays only)
Gill rakers
on lower limb 14 - 17
on upper limb


Dorsal fin(s)

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

Caudal fin

Attributes forked; more or less normal

Anal fin(s)

Fins number 1
Spines total 0 - 0
Soft-rays total 21 - 25

Paired fins

Pectoral Attributes  more or less normal
Pelvics Attributes  more or less normal
Position    abdominal
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Geelhand, Dimitri
Modified by Geelhand, Dimitri
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cfm script by eagbayani, 17.10.00, php script by rolavides, 13/03/08 ,  last modified by sortiz, 06.27.17