Acanthicus hystrix, the lyre-tail pleco, is a species of armored catfish native to the Amazon, Tocantins–Araguaia and Orinoco basins. It is typically found at various depths on a rock or rock–gravel bottom in the main channel of rivers in places with moderate to strong current, although it also occurs in slow currents. The species is occasionally seen in the aquarium trade, but its adult size and territorially aggressive behavior means that a very large tank is required.