noun
Amakusa jellyfish (Sanderia malayensis)
A specific species of jellyfish; the name is a biological term, not a common everyday word.
水族館でアマクサクラゲを見た。
I saw an Amakusa jellyfish at the aquarium.
Named after the Amakusa region (天草) in Kumamoto Prefecture, where the species was first described, combined with クラゲ (jellyfish).