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]
| Least pencilfish | |
|---|---|
 | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Characiformes |
| Family: | Lebiasinidae |
| Genus: | Nannostomus |
| Species: | N. minimus |
| Binomial name | |
| Nannostomus minimus C. H. Eigenmann, 1909 | |
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.