Gymnotus darwini Campos-da-Paz & de Santana, 2019

Family:  Gymnotidae (Naked-back knifefishes), subfamily: Gymnotinae
Max. size:  15.7 cm TL (male/unsexed)
Environment:  benthopelagic; freshwater
Distribution:  South America: Brazil.
Diagnosis:  Dorsal soft rays (total): 12-14; Anal soft rays: 215-260. This species can be distinguished from all congeners in the 'Gymnotus carapo group clade' by the following set of characters: unique set of characters of uncertain polarity, including the number of prominent dark bands along the body, dark bands along body 3-4 times wider than pale interbands, with almost straight margins (never broken anteriorly into irregular dark spots), and bands almost uniform in color; number of scales above lateral line; number of lateral-line perforated scales to first ventral ramus; number of total pored lateral-line scales; head length; snout length; body depth; number of anal-fin rays; number of pectoral-fin rays; number of precaudal vertebrae; number of teeth on anterior row of premaxilla; and number of teeth along outer row of dentary (Ref. 128926).
Biology: 
IUCN Red List Status: Least Concern (LC); Date assessed: 01 July 2021 Ref. (130435)
Threat to humans:  harmless


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