organ-pipe coral
Refers to a type of coral with tubular, pipe-like structures, typically from the genus Tubipora.
水族館で管珊瑚の美しい骨格を見た。
I saw the beautiful skeleton of an organ-pipe coral at the aquarium.
Compound of 管 (kuda, 'pipe') + 珊瑚 (sango, 'coral'), describing its pipe-like appearance.