Astyanacinus

Rarity: Common

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What Wikipedia says

Astyanacinus is a monospecific genus of freshwater ray-finned fish belonging to the family Acestrorhamphidae, the American characins. The only species in the genus is Astyanacinus moorii which is found in the Upper Paraguay River basin in Bolivia and Brazil.

Excerpt from the Wikipedia article “Astyanacinus”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: George Albert Boulenger, Public domain, via Wikimedia Commons.