Morphology Data of Hemibrycon tridens
Identification keys
Abnormalities
Main Ref. Bertaco, V.A. and L.R. Malabarba, 2010
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors
Remarks Male easily recognized by the presence of bony hooks on the anal- and pelvic-fin rays; no gill gland was observed on first gill arch (Ref. 85819).

Descriptive characteristics of juvenile and adult

Striking features
Body shape lateral elongated
Cross section compressed
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth
Type of scales cycloid scales
Diagnosis

This species is readily distinguished from its congeners, except H. beni, by the number of branched anal-fin rays (17 vs. 18-34). It differs from H. beni by the number of lateral line scales (39 vs. 44-53), and by the number of scale rows above and below lateral line (6 and 5 vs. 7-8 and 6-8, respectively); from H. helleri and H. mikrostiktos which have lower branched anal-fin rays (19-23 and 18-21), H. tridens differs by the number of lateral line scales (39 vs. 40-42 and 42-45, respectively) (Ref. 85819).

Ease of Identification

Meristic characteristics of Hemibrycon tridens

Lateral Lines Interrupted: No
Scales on lateral line 39 - 39
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line 6 - 6
Scale rows below lateral line
Scales around caudal peduncle 14 - 14
Barbels
Gill clefts (sharks/rays only)
Gill rakers
on lower limb 10 - 10
on upper limb 5 - 5
total
Vertebrae
preanal 18 - 18
total 40 - 40

Fins

Dorsal fin(s)

Attributes
Fins number
Finlets No. Dorsal   
Ventral  
Spines total
Soft-rays total 8 - 8
Adipose fin

Caudal fin

Attributes

Anal fin(s)

Fins number
Spines total
Soft-rays total 7 - 7

Paired fins

Pectoral Attributes  
Spines     
Soft-rays   10 - 10
Pelvics Attributes  
Position    
Spines     
Soft-rays   6 - 6
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