这个词是什么意思？
A phylum of small sessile aquatic animals living as small tufted colonies. Some appear like hydroids or corals, but their internal structure is more advanced. Most bryozoans are matlike, forming thin encrustations on rocks, shells, or kelp. (Storer & Stebbins, General Zoology, 6th ed, p443)
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D002013 · MeSH 2026。
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