团藻(Volvox)为绿藻门团藻科一种藻体，分布于静止的小型池滨内，春季较盛，并常成纯群。

藻体为球形群体，直径约一、二毫米，能游动，整体由数百至上万个具有鞭毛的细胞排列在球体表面所成，中央腔内充满粘液，每个细胞的形状、结构与衣藻相似，各细胞之间有原生质丝相连，并有营养细胞和繁殖细胞之分，营养细胞数量大。

Volvox is a polyphyletic genus of chlorophyte green algae in the family Volvocaceae. It forms spherical colonies of up to 50,000 cells. They live in a variety of freshwater habitats, and were first reported by Antonie van Leeuwenhoek in 1700. Volvox diverged from unicellular ancestors approximately 200 million years ago.