Gymnotus onca Albert & Crampton, 2001
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 Family:  Gymnotidae (Naked-back knifefishes)
 Max. size:  12 cm TL (male/unsexed)
 Environment:  demersal
 Distribution:  South America: upper Amazon River basin, Brazil.
 Diagnosis:  Possess broad irregular dark pigment blotches without alternating light and dark pigments bands and very short head (head length 8.8% TL versus 9-13).
 Biology:  Collected in a whitewater floating meadow of the floodplain in the TefĂ© region (Ref. 41292).
 IUCN Red List Status: Not Evaluated  (Ref. 96402)
 Threat to humans:  harmless
 Country info:   
 

 Entered by: Casal, Christine Marie V. - 08.02.02
 Modified by: Reyes, Rodolfo B. - 15.11.13

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