Morphology Data of Nannocharax rubrolabiatus
Identification keys
Abnormalities
Main Ref. Vari, R.P., 2007
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors
Remarks

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 sub-terminal/inferior
Type of scales
Diagnosis

Diagnosis: 50-53 (Ref. 81638) or 46 (Ref. 26632) scales in lateral line. 6-7 anal fin branched rays; dorsal portions of body with distinct dark, vertically oriented dark marks that form saddle-shaped pigmentation pattern; prominent horizontally elongate, dark spots on mid-lateral surface of body (Ref. 81638).

Description: body moderately elongate, depth 0.19-0.23 SL and slightly laterally compressed; mouth relatively small and slightly subterminal; both jaws with 1 row of bicuspid teeth; premaxilla with 4 and dentary with 4-6 teeth; maxilla edentulous; distal portions of lateral pelvic rays enlarged in some specimens; middle pelvic rays longest and reaching beyond vent about one third of distance between vent and anal fin origin; larger specimens (mature males?) with basally directed retrose hooks on dorsal surface of first through 6th to 8th branched rays; all scales ctenoid in immatures and females of moderate size; some individuals (mature males?) with numerous fleshy ‘contact organs’ distributed over head, body and margin of rays; scales medial to pectoral fin lack posterior ctenii, but have lateral surfaces of scales completely covered with anteriorly directed hooks; lateral line irregularly pored in smaller individuals, but complete in larger specimens; 4-5 scales between anal fin origin and lateral line; D: III,10-11; A: III,6-7 (Ref. 81638). 9-11 dorsal-fin branched rays (Ref. 26632). 5 (Ref. 81638) or 5.5 (Ref. 26632) scales between lateral line and dorsal-fin origin.

Coloration: preserved specimens yellowish tan, darker dorsally; dorsal portion of head and ventrolateral portion of opercle darker; dorsal and dorsolateral portions of body with 7-9 saddle-shaped marks continuous with irregular mid-lateral band formed of 5-6 horizontally elongated spots; ventral portion of body with series of irregularly vertical, dark bars aligned in some cases with dorsal saddles (Ref. 81638). More details on fin coloration can be found in Ref. 81638.

Ease of Identification

Meristic characteristics of Nannocharax rubrolabiatus

Lateral Lines 1 Interrupted: No
Scales on lateral line 46 - 53
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line 5 - 5.5
Scale rows below lateral line 4.5 - 4.5
Scales around caudal peduncle 17 - 17
Barbels 0
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total
Vertebrae
preanal
total 37 - 37

Fins

Dorsal fin(s)

Attributes no striking attributes
Fins number 1
Finlets No. Dorsal   
Ventral  
Spines total 0 - 0
Soft-rays total 12 - 14
Adipose fin present

Caudal fin

Attributes forked; more or less normal

Anal fin(s)

Fins number 1
Spines total 0 - 0
Soft-rays total 9 - 10

Paired fins

Pectoral Attributes  
Spines     0
Soft-rays   18 - 19
Pelvics Attributes  more or less normal
Position    abdominal
Spines     0
Soft-rays   9 - 10
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