Desmidiales is an order of plants. There are 3139 species of Desmidiales, in 53 genera and 4 families. It includes groups like Peniaceae, Closteriaceae, and Gonatozygaceae.
Definition: 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.
Definition: 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)