Hisonotus laevior
Hisonotus laevior is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the Lagoa [dos Patos] system, ranging from Lagoon Mirim to the Jacuí River basin. It is found in slow to moderate-flowing waters with sandy substrate and submerged vegetation. The species reaches 7.5 cm in total length.