Annelida definition

  • proper-noun:
    • A taxonomic phylum within the superphylum Protostomia — the annelid worms.
  • noun-plural:
    • A division of the Articulata, having the body formed of numerous rings or annular segments, and without jointed legs. The principal subdivisions are the Chætopoda, including the Oligochæta or earthworms and Polychæta or marine worms; and the Hirudinea or leeches. See chætopoda.
  • others:
    • The annelids or Annelides, a class of invertebrate animals, associated with phylum Vermes, often called the course of red-blooded worms.
    • In Huxley's system (1877), a superordinal unit such as the Polychœta, Oligochœta, Hirudinea, and Gephyrea, aided by the Myzostomata doubtfully added thereto: a group the members of which resemble each other generally in the segmentation regarding the human body suggested at the very least because of the serially multiganglionate nervous facilities (desiring generally in most Gephyrea), when you look at the presence of cilia and segmental organs, and in the character associated with larvæ, that are set no-cost whenever embryos hatch.
  • noun:
    • segmented worms: earthworms; lugworms; leeches

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