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Elephant-nose Knifefish are laterally compressed, with an elongated snout. The snout is generally straight, though it may have has a slight downward curve. Individuals of this species range between 300 and 400 mm, with females generally being larger than the males. They have dark pigmentation that generally reflects the surrounding environment. Anal and pectoral fins tend to be darker at the ends than the rest of the body. (De Santana and Vari 2010).