Berghia stephanieae, a marine gastropod (sea slug) in the family Aeolidiidae.
https://media.mas.to/masto-public/media_attachments/files/109/376/780/558/377/563/original/c95ff9b48958c211.png
I saw a presentation on the defensive behavior of a show-white nudibranch, Berghia. It has spines on its back like a caterpillar, and the spines are equipped with nematocytes obtained from anemones. When poked on the back, the spines quickly surround the stick to attack. This is a defensive reflex behavior.
#SfN22 のポスターでベルギアっていう純白ウミウシの防御行動があって面白かったんだけど、そのウミウシは毛虫みたいに背中にトゲトゲがあり、棘の表面にイソギンチャクからもらった刺胞が備わってる。棒で背中をつつくとその棘がサッと棒を囲い攻撃するように反射的に動く
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