Morphology Data of Gymnotus esmeraldas
Identification keys
Main Ref. Albert, J.S. and W.G.R. Crampton, 2003
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors

Descriptive characteristics of juvenile and adult

Striking features
Body shape lateral
Cross section
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth

Absence of alternating dark and light pigment bands on the anterior 80% of the body. Specimens from the Río Esmeraldas basin with a unique speckled color patter composed of irregular pale yellow or cream-colored patches interspersed on a dark brown ground color over most body and anal fin surfaces, in which the pale pigment patches are abut 2-3 scales in width and height (Ref. 49716).

Ease of Identification

Meristic characteristics of Gymnotus esmeraldas

Lateral Lines Interrupted: No
Scales on lateral line
Pored lateral line scales 115 - 119
Scales in lateral series
Scale rows above lateral line
Scale rows below lateral line
Scales around caudal peduncle
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb


Dorsal fin(s)

Fins number
Finlets No. Dorsal   0 - 0
Ventral  0 - 0
Spines total 0 - 0
Soft-rays total 0 - 0
Adipose fin absent

Caudal fin


Anal fin(s)

Fins number
Spines total
Soft-rays total 226 - 260

Paired fins

Pectoral Attributes  
Soft-rays   17 - 19
Pelvics Attributes  suppressed/absent
Spines     0
Soft-rays   0 - 0
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Garilao, Cristina V.
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