Sanderia malayensis is a species of jellyfish in the family Pelagiidae, native to the tropical Indo-Pacific. It has a complex life cycle and is thought to be venomous and to have caused injuries to humans.

Amakusa (Sanderia Malayensis) are a common jellyvorous jellyfish seen in South coast of Japan in summer. They are commonly seen in captivity because they are relatively easy to keep. Amakusa jellyfish have 32 lappets, 4 oral arms and 16 very long tentacles coming out from the bell. Their colour varies from brown to white.