Sternopygus

Rarity: Common

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What Wikipedia says

Sternopygus is a genus of glass knifefishes found in tropical and subtropical South America (south to the Río de la Plata Basin), and Panama. It is the only extant member of the subfamily Sternopyginae, with the related fossil genus †Humboldtichthys also known from Bolivia.

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

Image: François-Louis Laporte, comte de Castelnau, Public domain, via Wikimedia Commons.