(Gr. ôon: egg; mykês, mykêtos: fungus) A phylum of the Protoctista that includes the water moulds, downy mildews, and potato blight (Phytophthora), formerly classified as a class of fungi (Oomycetes). They are coenocytic and the cell wall is made of cellulose. Oomycotes are either saprotrophic or parasitic; they feed by extending hypha-like threads into the food source or host's body. Asexual reproduction is by means of flagellated zoospores, which are released from a sporangium. Sexual reproduction involves the fusion of an antheridium and an oogonium and results in the production of a zygote, which can develop a wall of chitin and become a resistant oospore.
The Phylum Oomycota is a member of the Kingdom Chromista. Here is the complete "parentage" of Oomycota:
The Phylum Oomycota is further organized into finer groupings including:
- Family (28): Albuginaceae · Anisolpidiaceae · Apodachlyellaceae · Crypticolaceae · Ducellieriaceae · Ectrogellaceae · Eurychasmataceae · Haliphthoraceae · Haptoglossaceae · Lagenaceae · Lagenismataceae · Leptolegniaceae · Leptolegniellaceae · Leptomitaceae · Myzocytiopsidaceae · Olpidiopsidaceae · Peronosporaceae · Pontismataceae · Pseudosphaeritaceae · Pythiaceae · Pythiogetonaceae · Rhipidiaceae · Rozellopsidaceae · Salilagenidiaceae · Saprolegniaceae · Sclerosporaceae · Sirolpidiaceae · Verrucalvaceae
- Species: ZipcodeZoo has pages for 1,912 species and subspecies in the Phylum Oomycota.
Peronosporaceae are a family of water moulds that contains 17 genera, comprising more than 600 species. Most of them are called downy mildews. The closest relative of Peronosporaceae is Phytophthora. [more]
Pythiaceae is family of water moulds. The family includes plant pathogenic fungus-like organisms in the genus Phytophthora; as well as serious plant and animal pathogens in the genus Pythium. [more]
Saprolegniaceae is a family of freshwater mould. [more]
At least 10 species and subspecies belong to the Family Verrucalvaceae.
More info about the Family Verrucalvaceae may be found here.
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