Nannostomus eques, commonly known as the diptail or brown pencilfish, is a freshwater species of fish belonging to the Lebiasinidae family of characins. It was first described in 1876 by Franz Steindachner making it one of the first members of the genus to be discovered and described. It is fairly typical of members of this genus being a small, elongated fish with prominent horizontal stripes. It occurs quite widely in South America, having been recorded in Brazil, Peru, Colombia, and Guyana. It is also quite commonly met with in the aquarium trade where its habit of swimming and posturing at a 'snout-up' angle—one of two Nannostomus species to do so, the other being Nannostomus unifasciatus—makes it a popular choice.
- "ITIS report Nannostomus eques TSN 163111". Retrieved Feb 17, 2012.
- "Fishbase report Nannostomus eques". Retrieved Feb 17, 2012.
- "Seriously Fish report Nannostomus eques". Retrieved Feb 17, 2012.
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