Any of various wormlike marine invertebrates of the phylum Pogonophora that grow in upright chitin tubes, usually at depths greater than100 meters(330 feet), have tentacles attached to the head region, and lack a digestive system.

• 须腕动物须腕门中的一种蠕虫状海生无脊椎动物，生长在直立的甲壳质管中，通常在100米（330英尺）以下的水中生活，有附于头部的须毛，而缺少消化器官