Biotoecus

Rarity: Common

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At a glance

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What Wikipedia says

Biotoecus is a fish genus of cichlids from northern South America where one species (B. dicentrarchus) is found in the Orinoco Basin and the other (B. opercularis) occurs in the northern part of the Amazon Basin. These small cichlids do not surpass 10 cm (3.9 in) in length.

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

Image: Clinton & Charles Robertson, CC BY 2.0, via Wikimedia Commons.