Aschelminthes

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Definition
  1. Noun:
    • A taxonomic class or phylum (in some obsolete classifications) comprising various unsegmented worms: "Aschelminthes" refers to a former major taxonomic grouping that included several phyla of worms characterized by their generally cylindrical, unsegmented bodies. This grouping is now considered polyphyletic and is not used in modern taxonomy.
Usage Examples
  • Noun:
    • The phylum Aschelminthes once included nematodes and rotifers.
    • Older biology textbooks may classify roundworms under Aschelminthes.
Advanced Usage
  • Historical Taxonomic Context: The term is primarily used in a historical scientific context to discuss the evolution of biological classification.
    • The concept of Aschelminthes has been superseded by more accurate phylogenetic studies.
Variants and Related Words
  • Nematoda (n): The phylum containing roundworms, a major group formerly placed within Aschelminthes.
    • The parasitic roundworm Ascaris is a member of the phylum Nematoda.
  • Rotifera (n): A phylum of microscopic animals, also once classified under Aschelminthes.
  • Unsegmented worm (n): A descriptive term for the worms historically grouped as Aschelminthes.
Synonyms
  • Pseudocoelomates: A term describing animals with a body cavity not fully lined by mesoderm, which includes many former aschelminth groups.
  • Roundworms: A common name for nematodes, the most prominent group within the old Aschelminthes.
Notes on Usage
  • The term "Aschelminthes" is largely obsolete in modern scientific literature. When discussing these organisms, it is more precise to refer to their current phyla (e.g., Nematoda, Rotifera). The word is useful for understanding historical biological texts.
Noun
  1. unsegmented worms: roundworms; threadworms; eelworms

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