There are about 8,000 species of green algae. There are about 6000 species of green algae. It feeds mainly on green algae. Cladophora is a genus of reticulated filamentous Ulvophyceae (green algae). Tadpoles consume small quantities of filamentous green algae and desmids. "Volvox" is a polyphyletic genus in the volvocine green algae clade. The mixture of seaweeds and blue green algae may serve as ideal fertilizer. Chlorophyta or Prasinophyta is a taxon of green algae informally called chlorophytes. Back in the Silurian, some phytoplankton evolved into red, brown and green algae. The dominant group of snow algae is chlamydomonas , a type of green algae. Sulfated saccharides from red and green algae inhibit some DNA and RNA-enveloped viruses. Alkyl also refers to an active ingredient in green algae preventatives used in swimming pools. In contrast, Copeland's term included nucleated eukaryotes such as diatoms, green algae and fungi. Therefore, cladistically, embryophytes belong to green algae as well. Diplobiontic green algae include isomorphic and heteromorphic forms.