phylum aschelminthes

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Definition

Noun: 1. A major taxonomic group in biology: "phylum Aschelminthes" is a taxonomic classification for a large group of invertebrate animals. This phylum historically included various pseudocoelomate worms, characterized by their unsegmented, often cylindrical bodies and a complete digestive tract. Modern taxonomy often splits this group into several separate phyla (such as Nematoda, Rotifera, etc.), so the term "Aschelminthes" is considered by many to be obsolete or used in a historical context.

Usage Examples
  • Noun:
    • In older textbooks, the roundworms were classified under the phylum Aschelminthes.
    • The diversity within the phylum Aschelminthes includes both free-living and parasitic species.
Advanced Usage
  • Used in a historical or taxonomic context: The term is primarily used when discussing the history of biological classification or in specific taxonomic references.
    • The concept of phylum Aschelminthes has been largely superseded by more precise phylogenetic studies.
Variants and Related Words
  • Nematoda (n): A major phylum of roundworms, which were a primary component of Aschelminthes.
    • The phylum Nematoda contains many important parasites.
  • Rotifera (n): A phylum of microscopic animals, also once classified under Aschelminthes.
    • Rotifers are common in freshwater habitats.
  • Pseudocoelomate (adj/n): Describing the body cavity type characteristic of these worms.
    • A pseudocoelomate body plan is a key feature.
Synonyms
  • Nemathelminthes (n): An alternative, roughly equivalent taxonomic name sometimes used for a similar grouping of worms.
Noun
  1. unsegmented worms: roundworms; threadworms; eelworms

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