Dibranchia

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Definition
  1. Noun:
    • A subclass of cephalopods: "Dibranchia" is a taxonomic subclass comprising all living cephalopods except the family Nautilidae. It is characterized by having two gills. The group includes the orders Octopoda (octopuses) and Decapoda (squids and cuttlefish).
Usage Examples
  • Noun:
    • The class Cephalopoda is divided into two main groups: the Nautiloidea and the Dibranchia.
    • Squids, which belong to the Dibranchia, have a more complex nervous system than nautiluses.
Advanced Usage
  • In taxonomic classification: The term "Dibranchia" is used in scientific zoological contexts to classify a major group of cephalopod mollusks based on anatomical features, specifically the number of gills.
    • The evolutionary success of the Dibranchia is attributed to their advanced jet propulsion and ink-sac defense mechanisms.
Variants and Related Words
  • Dibranchiate (adj): Having two gills. This adjective form describes the characteristic feature of the subclass.
    • Dibranchiate cephalopods like the octopus are highly intelligent.
Synonyms
  • Two-gilled cephalopods: A descriptive synonym referring to the defining physical characteristic.
  • Coleoidea: In modern taxonomy, "Coleoidea" is often used as a more current equivalent or sister group to "Dibranchia," encompassing the same cephalopods (octopuses, squids, cuttlefish) with internal shells or no shells.
Noun
  1. comprising all living cephalopods except the family Nautilidae: the orders Octopoda (octopuses) and Decapoda (squids and cuttlefish)

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