身体透明并有许多附肢的淡水小型鳃足动物；倒置游动。

Small freshwater branchiopod having a transparent body with many appendages; swims on its back.

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在节肢动物早期演化阶段，前附肢的演化是提高动物感觉和捕食能力的重要事件。

The evolution of the frontal appendage is an important event for the early arthropods to improve their feeling and feeding ability under the fiercely 'arm race' press in Cambrian explosion.

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例如，1919年，在加拿大温哥华岛附近捕获了一条座头鲸，它有一对长达1米多的腿状附肢，还有完整的整套肢骨。

In 1919, for example, a humpback whale with a pair of leglike appendages over a metre long, complete with a full set of limb bones, was caught off Vancouver Island in Canada.

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