Morphology Data of Metynnis cuiaba
Identification keys
Main Ref. Pavanelli, C.S., R.P. Ota and P. Petry, 2009
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors
Remarks Adult males with a lobule at the distal edge of the anal fin and dorsal-fin rays not elongated while adult females with distal anal-fin margin somewhat straight and first dorsal-fin rays elongated, forming filaments only during breeding period (Ref. 81196).

Descriptive characteristics of juvenile and adult

Striking features
Body shape lateral short and / or deep
Cross section
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth terminal

Distinguished from other congeners by the combination of the following characters: gill rakers 22-24; scales on lateral line 100-110; scales rows above lateral line 48-56; predorsal scales 55-64; circumpeduncular scales 32-36; one or two bifurcate spines in the ventral keel; dark blotches, with ill-defined contour, sometimes forming transversal bars in the flanks (Ref. 81196).

Description: Dorsal-fin rays i,15-17; anal-fin rays iii,32-36; pectoral-fin rays i,10-13; pelvic-fin rays i,6-7 (Ref. 81196).

Ease of Identification

Meristic characteristics of Metynnis cuiaba

Lateral Lines Interrupted: No
Scales on lateral line
Pored lateral line scales 100 - 110
Scales in lateral series
Scale rows above lateral line 48 - 56
Scale rows below lateral line 53 - 60
Scales around caudal peduncle 32 - 36
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total 38 - 38


Dorsal fin(s)

Fins number 1
Finlets No. Dorsal   
Spines total
Soft-rays total 16 - 18
Adipose fin present

Caudal fin

Attributes more or less truncate

Anal fin(s)

Fins number
Spines total
Soft-rays total 35 - 39

Paired fins

Pectoral Attributes  more or less normal
Soft-rays   11 - 14
Pelvics Attributes  more or less normal
Position    abdominal  before origin of D1
Soft-rays   7 - 8
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Torres, Armi G.
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