Epactionotus gracilis
Epactionotus gracilis is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the Araranguá River basin. It reaches 3.9 cm (1.5 inches) SL. References 

Otothyrinae
Taxa named by Roberto Esser dos Reis
Taxa named by Scott Allen Schaefer
Catfish of South America
Fish described in 1998