パイプウニ。 夜行性で昼間は岩の間に潜む。 岩陰に潜伏中は、キャッチ結合組織の働きによってトゲは強力に固定さていれる。Slate pencil urchin. It is nocturnal and remains hidden behind rocks during the day. While hiding in rocks, needles are fix…
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