Panaqolus nocturnus
Panaqolus nocturnus, known as the dusky panaque, is a species of small catfish in the family Loricariidae found in the Santiago and Pastaza River basins in the upper Napo drainage in tropical South America. This species reaches a maximum standard length of . References

Ancistrini
Catfish of South America
Fish of Brazil
Endemic fauna of Brazil
Taxa named by Scott Allen Schaefer
Taxa named by Donald J. Stewart
Fish described in 1993