[1][2] A. luciae are freshwater fishes found in fast flowing, shallow waters, and at the bases of small waterfalls with rocky stream beds where they shelter in crevices from swift currents and prey on insect larvae.

[1] The pectoral fins, which are attached posterior to the operculum, are long, broad at the base, and distally pointed.

[5] The eyes are small, located on the dorsal portion of the head and posterior to the elongated, subconical snout.

[1] The mouth is inferior with a longer upper jaw that overlaps the lower jaw, having multiple rows of small, pointed teeth that form a villiform band along the dentary and premaxilla.

[1] The body of A. luciae is darker in color above the distinct lateral line.