Trumpet sea urchin (Toxopneustes pileolus)

Japanese: ラッパウニ(喇叭海胆) - ラッパウニ（英語表記）Toxopneustes pileolus

An echinoderm (illustration) of the family Trumpetidae in the class Echinoidea. It is so named because it has forked spines that have been modified into a trumpet shape. The shell is circular, almost pentagonal, and the largest ones are about 10 cm in diameter and 5 cm in height. It is usually pale green-brown in color, but there are various variations. The shell is fragile. The large spine is short and has a rounded tip, with three broad red bands. The forked spines are longer than the large spine, are trumpet-shaped, and cover the intertrochanteric bands. There is a poison gland at the base of the forked spine, which secretes a toxin that paralyzes the target when it comes into contact with a foreign object, so it is best not to touch it with bare hands.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

ウニ綱ラッパウニ科の棘皮（きよくひ）動物（イラスト）。らっぱ形に変形している叉棘（さきよく）をもつところからこの名がある。殻は五角形に近い円形で，大きなものでは直径約10cm，高さ5cmになり，淡緑褐色のものがふつうであるが，いろいろ変異がある。殻質はもろい。大棘は短くて先端が丸く，幅の広い赤い色帯が3本ある。叉棘は大棘よりも長く，らっぱ形で間歩帯をおおう。叉棘の基部には毒腺があって，外物に接すると毒素を分泌して相手を麻痺させるので素手でさわらぬほうがよい。

出典　株式会社平凡社世界大百科事典第２版について　情報

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