Megalorchestia corniculata is a species of beach hopper in the family Talitridae.
Megalorchestia corniculata is a crucial consumer of wrack. By consuming washed-up seaweed, Megalorchestia corniculata helps process it and contributes to nutrient cycling in sandy beach ecosystems. Megalorchestia corniculata plays a vital role in breaking down organic matter like kelp, which promotes nutrient availability in intertidal environments. Consuming it and excreting ammonium enhances the nutrient cycling in sandy beaches.