Any of various chordate marine animals of the subphylum Tunicata or Urochordata having a cylindrical or globular body enclosed in a tough outer covering and including the sea squirts and salps.

• 被囊动物属于尾索亚门或囊亚门的各种脊索类海生动物中的一种，身体呈圆形或球形，包在坚硬的壳中，这动物包括海鞘和萨尔帕属的背囊动物