Mordacia lapicida, also known as the Chilean lamprey, is a species of southern topeyed lamprey endemic to southern Chile, where it can be found in riverine and marine habitats.

This parasitic lamprey can reach a length of 54 centimetres (21 in) SL.

[3] The life cycle of a Mordacia lapicida is divided into three life stages: freshwater rearing, an ocean parasite and an adult spawning stage.

[4] Once in the adult stage, individuals migrate into marine waters where they attack and attach themselves to marine fishes.

[5] For this species, metamorphosis occurs during August and March.