Definition

1. Noun:
   • A taxonomic class of mandibulate arthropods: "Class Crustacea" is a scientific classification in biology for a major group of arthropods characterized by having two pairs of antennae, mandibles for chewing, and typically a calcareous exoskeleton. This class includes familiar aquatic and some terrestrial species.

Examples of Usage

• Noun:
  • The class Crustacea includes economically important species like crabs and shrimp.
  • Barnacles, though sessile as adults, are members of the class Crustacea.
  • Students studied the diverse body plans within the class Crustacea.

Advanced Usage

• Used in scientific taxonomy: The term is primarily used in zoological and biological contexts to categorize and discuss this specific group of animals.
  • The phylogeny of the class Crustacea is a complex subject of ongoing research.

Variants and Related Words

• Crustacean (n): Any member of the class Crustacea.
  • Lobsters and water fleas are both crustaceans.
• Crustaceous (adj): Having a hard shell or crust; of or relating to crustaceans.
  • The crustaceous exoskeleton provides protection.

Synonyms

• Shellfish (common, non-scientific term): Often used for edible crustaceans and mollusks, but is less precise as it includes animals from different phyla.
• Crawfish/Crayfish (specific types): Refers to specific freshwater crustaceans within the class.

Related Phrases

• Crustacean larvae: The immature, often planktonic, stages of development for many members of this class.
  • The zooplankton sample was rich in crustacean larvae.

Related Idioms

(Note: As a precise scientific term, "class Crustacea" does not feature in idiomatic expressions. Idioms typically involve common names like "crab" or "shrimp.")

Noun

1. class of mandibulate arthropods including: lobsters; crabs; shrimps; woodlice; barnacles; decapods; water fleas