primitive marine animal having a saclike unsegmented body and a urochord (a notochord) conspicuous in the larva.
有囊状不段状身体的原始海洋动物,幼虫阶段有明显的脊。
primitive marine animal having a saclike unsegmented body and a urochord (a notochord) conspicuous in the larva.
有囊状不段状身体的原始海洋动物,幼虫阶段有明显的脊。
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