定义：forming a multicellular tubular thallus composed of multinuclear cells that are created when nuclear division is not accompanied by the formation of cell walls
定义：This organism produces this material or substance, either during its life or after death. A produces B if some process that occurs in A has output B.
定义：A group of species that exploit the same food resources, and/or use the same feeding or foraging methods. http://en.wikipedia.org/wiki/Guild_(ecology)
