acephala definition

  • noun-plural:
    • That unit regarding the Mollusca including the bivalve shells, just like the clams and oysters; -- so called since they have no evident head. Formerly the team included the Tunicata, Brachiopoda, and quite often the Bryozoa. See mollusca.
  • others:
    • a phrase introduced by Cuvier into organized zo├Âlogy, and applied by him as a class title to a combination of the conchiferous lamellibranchiate mollusks therefore the tunicates.
    • Just Like Acrania.
    • In Latreille's system of category (1795), among seven sales of this Linnean Aptera, containing the spiders, etc., matching on Arachnides palpistes of Lamarck, and synonymous with Arachnida.
    • In Haeckel's category, a group of Mollusca made up of the Spirobranchia, or Brachiopoda, together with Lamellibranchia.

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