tunicate

1. Minute floating marine tunicate having a transparent body with an opening at each end.
   身体透明、两端有孔并且有背囊的微小的浮游海洋动物。
2. Water temperature, algal distribution and currents were the most relevant environmental factors influencing the tunicate abundance and distribution in the North Yellow Sea.
   温度、浮游植物分布和海流是影响北黄海浮游被囊类分布最相关的环境因子。

noun

1. primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva

   Synonym:    urochordateurochord