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Specimens of: A. Gymnotus carapo from Capanema, Pará, Brazil (2n = 42) (MPEG 13331); B. Gymnotus carapo from Almeirim, Pará, Brazil (2n = 40) (MPEG 13329). Scale bar = 10 mm. Specimen A was photographed fresh, while specimen B was frozen and photographed after defrosting. This partially explains the color differences.
