Geosesarma malayanum is a species of small red crab found in Malaysia.

[1] It is famous for its relationship with pitcher plants; as such, it is classified as a nepenthephile.

[2] G. malayanum is known to visit Nepenthes ampullaria plants and raid the pitchers of their contents.

[1] It uses its claws to crush and consume the drowned prey.

However, the crabs are reportedly trapped by pitchers in Brunei occasionally.