The shape of the Styela plicata digestive tract is "U". The tract includes esophagus, stomach, foreguU midgut, hindgut, rectum and anus.
皱瘤海鞘的消化道为一条“U”形的管道，包括食道、胃、前肠、中肠、后肠、直肠至肛门。
参考来源 - 厦门文昌鱼和皱瘤海鞘消化道内分泌功能的比较研究·2,447,543篇论文数据，部分数据来源于NoteExpress
以上来源于: WordNet
N-COUNT Someone's rectum is the bottom end of the tube down which waste food passes out of their body. 直肠 [医学]
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