Morphology Summary - Characidium onca
Morphology Data of Characidium onca
Identification keys
Abnormalities
Main Ref. Melo, M.R.S., M.C.L. Brito Ribeiro and F.C.T. Lima, 2021
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors
Remarks

Descriptive characteristics of juvenile and adult

Striking features
Body shape lateral  (shape guide)
Cross section oval
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth
Type of scales
Diagnosis

This species is distinguished from its congeners by the following characters: presence of small dots on the side of the body, arranged in two or three distinct longitudinal lines; short pectoral fin, not reaching the vertical that passes through the origin of the dorsal fin; absence of adipose fin and bars; scaled isthmus; absence of blotches on dorsum; presence of longitudinal gold stripe; and mouth small, terminal. Colouration: yellow to brownish with dorsum darker and whitish belly, with gold tint on opercle, eye and parts of the head (123789).

Ease of Identification easy to distinguish from other species.

Meristic characteristics of Characidium onca

Lateral Lines Interrupted: No
Scales on lateral line
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line
Scale rows below lateral line
Scales around caudal peduncle
Barbels
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total
Vertebrae
preanal 20 - 21
total 35 - 36

Fins

Dorsal fin(s)

Attributes
Fins number
Finlets No. Dorsal   
Ventral  
Spines total
Soft-rays total 8 - 10
Adipose fin absent

Caudal fin  (shape guide)

Attributes

Anal fin(s)

Fins number
Spines total
Soft-rays total 6 - 6

Paired fins

Pectoral Attributes  
Spines     
Soft-rays   4 - 6
Pelvics Attributes  
Position    
Spines     
Soft-rays   4 - 7
(e.g. 9948)
(e.g. oophagy)
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