Otocinclus mariae
Otocinclus mariae is a species of catfish in the family Loricariidae. It is native to the Amazon Basin, where it is known from the upper Madeira River and the lower Amazon River in Bolivia and Brazil. It reaches 3.3 cm (1.3 inches) SL. References 

Hypoptopomatini
Fish of the Amazon basin
Fish of Bolivia
Freshwater fish of Brazil
Fish described in 1940
Taxa named by Henry Weed Fowler