A general term for three species of the genus Asthenosoma , an echinoderm in the family Echinothuriidae, or a species in two or three closely related genera. The shell plates that make up the sea urchin's shell are not fully bonded, making the entire shell flexible and allowing the body to deform. There are a great many shell plates, with 35 to 60 plates in a vertical row of intertrochanteric zones, and the number of trochanteric zone plates is about twice as many. The shell diameter is generally large, reaching 10 to 20 cm, but the height is short at 2 to 4 cm. There are four types of tubular spines. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
ウニ綱フクロウニ科Echinothuriidaeの棘皮(きよくひ)動物でフクロウニ属Asthenosomaの3種,または2~3の近縁属の種類の総称。ウニの殻を構成している殻板の結合が十分でないために殻全体が柔軟で,体を変形させることができる。殻板が非常に多く,間歩帯の縦列には35~60個の板が見られ,歩帯板の数はこの約2倍もある。殻径は一般に大きく,10~20cmになるが,高さは2~4cmと低い。4種類の管状のとげがある。
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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