family Nostocaceae

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Definition

Proper noun * Family Nostocaceae: A taxonomic family of cyanobacteria (blue-green algae) characterized by forming colonies of cells within a gelatinous sheath. Members of this family are found in diverse aquatic and terrestrial habitats and can fix atmospheric nitrogen.

Usage
  • Scientific Classification: Used primarily in biological and microbiological contexts to classify a specific group of cyanobacteria.
    • The sample was identified as belonging to the family Nostocaceae based on its filamentous structure and heterocyst formation.
    • Researchers are studying nitrogen fixation in several genera within the family Nostocaceae.
Advanced Usage
  • Taxonomic Hierarchy: The term is used within a specific rank in biological classification: Domain (Bacteria) > Phylum (Cyanobacteria) > Class > Order (Nostocales) > Family (Nostocaceae) > Genus (e.g., , ) > Species.
Variants and Related Words
  • Nostocaceae: The standard form, often used without "family" in technical writing.
    • The order Nostocales includes the families Nostocaceae and Rivulariaceae.
  • Nostocacean (adjective): Of or pertaining to the family Nostocaceae.
    • The nostocacean cyanobacteria formed visible mats on the pond surface.
Synonyms
  • Blue-green algae (family): A common, informal name for the broader group, though not a precise taxonomic synonym.
  • Cyanobacteria (family): The more precise modern term for the bacterial phylum, specifying the family level.
Notes on Meaning
  • The term refers exclusively to a formal taxonomic grouping in scientific nomenclature. It is not used in everyday language.
  • While "blue-green algae" is a historical and common name for these organisms, it is important to note that they are bacteria (prokaryotes), not true algae (eukaryotes). The family Nostocaceae is a subset of all cyanobacteria.
Noun
  1. blue-green algae

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