Amakusa jellyfish (Sanderia malayensis)
A specific species of jellyfish; the name is a biological term, not a common everyday word.
I saw an Amakusa jellyfish at the aquarium.
Katakana spelling is standard for this species name; usually written in kana.
Kanji spelling using 水母 for jellyfish; rarely used in practice.
Alternate kanji spelling using 海月 for jellyfish; rarely used.
Named after the Amakusa region (天草) in Kumamoto Prefecture, where the species was first described, combined with クラゲ (jellyfish).