Definition

Noun: - A class of marine mollusks: "Class Cephalopoda" is the scientific taxonomic class for a group of highly developed, exclusively marine mollusks characterized by a prominent head, large eyes, and a set of arms or tentacles. Members of this class include octopuses, squids, cuttlefish, and the nautilus.

Usage

• Scientific Classification: Used primarily in biological and zoological contexts to categorize and discuss this specific class of mollusks.
• General Description: Used to refer to the entire group of these intelligent, often fast-moving marine animals as a collective.

Examples

Advanced Usage

• In Evolutionary Biology: The term is used when discussing the evolutionary history of mollusks, noting adaptations like jet propulsion and complex behaviors in the class Cephalopoda.
• In Paleontology: Used to describe fossil representatives of this class, highlighting their long geological history.

Variants and Related Words

• Cephalopod (n): The common name for any member of the class Cephalopoda.
  • The giant squid is a fascinating cephalopod.
• Cephalopodic (adj): Relating to or characteristic of cephalopods (less common).
• Subclasses: Within class Cephalopoda, subclasses include Coleoidea (octopuses, squids, cuttlefish) and Nautiloidea (nautiluses).

Synonyms

• Cephalopods: This is the direct, more commonly used synonym for the members of this class, though it refers to the animals themselves rather than the taxonomic category.
• Head-footed mollusks: A descriptive synonym referencing the etymology ("cephalo" = head, "poda" = foot).

Related Phrases / Terms

• Ink sac: A defensive organ characteristic of many in the class Cephalopoda.
• Jet propulsion: A primary mode of locomotion for many cephalopods.
• Beak: The hard, parrot-like mouthpart found in cephalopods.

Noun

1. octopuses; squids; cuttlefish; pearly nautilus