Nautilidae

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Definition

Noun: 1. A family of cephalopods: Nautilidae is the scientific family name for a group of marine mollusks characterized by having an external, coiled, chambered shell. They are the only surviving family of the subclass Nautiloidea, which was once much more diverse. Members of this family are commonly called nautiluses.

Usage
  • The word Nautilidae is used primarily in scientific and zoological contexts to classify and discuss these specific animals. It is a proper noun (the name of a taxonomic family) and is often capitalized.
  • It is typically used with a singular verb when referring to the family as a single taxonomic unit.
Examples
  • Scientific Classification:
    • The Nautilidae includes the well-known chambered nautilus.
    • Fossil records show that the Nautilidae is a much older group than other modern cephalopods like squid and octopus.
  • General Discussion:
    • The biology of the Nautilidae is fascinating due to their primitive eyes and buoyancy mechanism.
Advanced Usage
  • In Taxonomic Hierarchy: The term is used precisely within biological classification:
    • Phylum: Mollusca, Class: Cephalopoda, Subclass: Nautiloidea, Order: Nautilida, Family: Nautilidae.
Variants and Related Words
  • Nautilus (noun): The common name for any living member of the family Nautilidae. Example:
  • Nautiloid (noun/adjective): (1) A member of the subclass Nautiloidea, which includes both extinct relatives and the living Nautilidae. (2) Resembling or related to a nautilus. Example:
Synonyms
  • Chambered nautilus family: A descriptive synonym.
  • Pearly nautiluses: A less common descriptive term.
Notes on Meaning
  • The definition is highly specific and taxonomic. In everyday language, the common name "nautilus" is used. Nautilidae refers specifically to the biological family grouping.
Noun
  1. spiral-shelled cephalopods

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