Shirahige sea urchin (Tripneustes gratilla)

Japanese: シラヒゲウニ(白鬚海胆) - シラヒゲウニ(英語表記)Tripneustes gratilla
Shirahige sea urchin (Tripneustes gratilla)
An echinoderm of the family Trumpetidae in the class Echinoidea. It is found in shallow waters south of the Kii Peninsula, and often has seaweed or shell fragments attached to its shell. It is named after the white spines that are mixed in. The shell is a rounded pentagon about 10 cm in diameter and 6 cm high, with a slightly conical upper surface. The large spines are white or reddish brown, short, and sharp at the tips. There are a total of 10 spineless black-purple vertical bands in the center of each of the walking bands and inter-walking bands, making the spiny areas clearly visible.

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。紀伊半島以南の浅海に分布し,殻の上に海藻や貝殻片などをつけていることが多い。白いとげが混じっていることからこの名がある。殻は径10cm,高さ6cmほどの丸みを帯びた五角形で上面はやや円錐形。大棘(だいきよく)は白色かまたは赤褐色で短く,先端がとがる。歩帯と間(かん)歩帯のそれぞれの中央部にとげのない黒紫色の縦帯が合計10本あるため,とげのある部分がはっきりしている。

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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