Duvalius abyssimus is a species of beetle described in 2014 by biologists Ana Sofia Reboleira and Vicente Ortuño. The species lives in the Krubera Cave in Abkhazia. It is about a quarter of an inch long and has no wings or functional eyes, or body pigment. It was discovered during expeditions of the Ibero-Russian Cavex Team - International Cave Exploration Team to Krubera-Vorónia (the deepest cave in the world) in 2010 and 2013.
Reboleira & Ortuño, 2014