Otocinclus hasemani
Otocinclus hasemani is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the Tocantins and Parnaíba basins. It reaches 2.7 cm (1.1 inches) SL. It is named for zoologist and explorer John Diederich Haseman. References 

Hypoptopomatini
Fish described in 1915