棘皮动物的一侧,包含一对步带,与另一侧(三叉区)相对,后者包含三个步带。
棘皮动物的一侧,包含一对步带,与另一侧(三叉区)相对,后者包含三个步带。
One side of an echinoderm, including a pair of ambulacra, in distinction from the opposite side (trivium), which includes three ambulacra.
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