Definition

Noun: 1. A taxonomic subdivision of fungi: A former major taxonomic group (often treated as a phylum or subphylum) characterized by the production of motile (self-propelled) spores or gametes. This group primarily includes water molds, downy mildews, and related organisms. In modern classification systems, many of these organisms have been reclassified.

Usage Notes

• This term is primarily used in scientific and biological contexts, specifically in mycology (the study of fungi) and taxonomy.
• It refers to a collective group of fungal organisms sharing the key characteristic of motility in their reproductive cells.
• Note that is a historical taxonomic grouping. Many contemporary classification systems no longer use this term, having redistributed its members into other groups like or .

Examples

• Scientific Description:
  • Organisms classified under Mastigomycota require water for the dispersal of their zoospores.
  • The study focused on the life cycle of a pathogen within the Mastigomycota.
• Taxonomic Context:
  • In older textbooks, water molds were placed in the Mastigomycota.

Advanced Usage

• Phylogenetic Context: The grouping is considered paraphyletic, meaning it includes some, but not all, descendants of a common ancestor. This is a key reason for its reclassification in modern phylogenetics.

Variants and Related Words

• Mastigomycotina (noun): A synonymous term, often used at the rank of a subphylum.
• Oomycota (noun): A modern phylum containing many organisms (like water molds and downy mildews) once classified as . They are now known to be more closely related to algae than to true fungi.
• Chytridiomycota (noun): A modern phylum of true fungi whose members produce motile zoospores, also once included in .
• Zoospore (noun): A motile asexual spore that uses a flagellum for movement, characteristic of organisms in this group.
• Flagellum (noun): A whip-like appendage that enables cell motility.

Synonyms

• Flagellated fungi (descriptive phrase)
• Zoosporic fungi (descriptive phrase)

Related Concepts (Not Synonyms)

• Phycomycetes (noun): An obsolete, broader class of "algal-like fungi" that historically included and .
• Fungi (noun): The kingdom to which these organisms were traditionally assigned, though some (like Oomycota) are now excluded.

Noun

1. fungi in which the spores and gametes are motile; in some systems placed in the Phycomycetes group with the Zygomycota