Morphology Data of Hemibrycon helleri
Identification keys
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 Males possess bony hooks on the dorsal-, pectoral-, anal- and pelvic-fin rays; differs slightly in body depth with females; with slightly concave anal-fin shape (nearly straight in females); and mature males with gill gland on first gill arch, covering the first branchial filaments (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

This species is distinguished from its congeners, except H. jelskii, by the size of humeral spot over 7-8 horizontal series of scales (vs. 3-6). H. helleri differs from H. jelskii by the number of branched anal-fin rays (19-23 vs. 25-30), and number of scales along anal-fin base scale sheath (6-12 vs. 13-28). It is rather similar to H. inambari, but can be distinguished by the size of humeral spot (over 7-8 vs. 5-6 horizontal series of scales), number of predorsal scales (16-18 vs. 13-16), and by the total number of vertebrae (41-43 vs. 39-40) (Ref. 85819).

Ease of Identification

Meristic characteristics of Hemibrycon helleri

Lateral Lines Interrupted: No
Scales on lateral line 42 - 45
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line 7 - 8
Scale rows below lateral line
Scales around caudal peduncle 16 - 18
Gill clefts (sharks/rays only)
Gill rakers
on lower limb 10 - 11
on upper limb 6 - 7
total 16 - 18
preanal 19 - 21
total 41 - 43


Dorsal fin(s)

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

Caudal fin


Anal fin(s)

Fins number
Spines total
Soft-rays total 19 - 23

Paired fins

Pectoral Attributes  
Soft-rays   10 - 11
Pelvics Attributes  
Soft-rays   6 - 6
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Capuli, Estelita Emily
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