Styela plicata is an ascidian which belongs to class Ascidiacea, subphylum urochordata, phylum Chordates. About 2000 kinds of ascidians have been found in the nature and they distribute over the maritime space.

• 海鞘(Ascidian)属于脊索动物门(Chordates)，尾索动物亚门(Urochordata)，海鞘纲(Ascidiacea)，全世界约有2000种，广泛分布于各海域中。