Nannostomus minimus, (from the Greek: nanos = small, and the Latin stoma = relating to the mouth; from the Latin: minimus = of the smallest size),[1][2] commonly known as the least pencilfish, is a freshwater species of fish belonging to the characin family Lebiasinidae.[3] It is restricted to Guyana, where it has been reported from the Potaro and Mazaruni Rivers.[4]

N. minimus reaches a length of 23 mm.[4] When described in 1909, it was the smallest of the known pencilfishes; that distinction has since passed to N. anduzei.

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