anostraca

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Definition

Noun 1. An order of crustaceans: Anostraca is the scientific name for an order of small, aquatic crustaceans. They are characterized by the absence of a carapace (a hard protective shell covering the back) and typically swim upside down. Common examples include fairy shrimp and brine shrimp.

Usage
  • The word Anostraca is used primarily in scientific and biological contexts to classify and discuss this specific group of organisms.
  • It is a formal taxonomic term (the name of an order).
Examples
  • Scientific Classification: "The class Branchiopoda includes the orders Anostraca, Notostraca, and Cladocera."
  • Ecological Study: "Researchers studied the population dynamics of Anostraca in the temporary vernal pools."
  • Descriptive Biology: "Unlike many other crustaceans, members of the Anostraca lack a carapace."
Advanced Usage
  • The term can be used adjectivally in scientific descriptions (e.g., "anostracan fauna," "anostracan species").
  • It is often contrasted with other crustacean orders like Notostraca (tadpole shrimp) or Cladocera (water fleas).
Variants and Related Words
  • anostracan (noun/adjective): A member of the order Anostraca; relating to this order.
    • Example: "The anostracan species Artemia salina is commonly used in aquaculture."
  • fairy shrimp (noun): A common name for many freshwater species within Anostraca.
  • brine shrimp (noun): A common name for saltwater species within Anostraca, especially of the genus .
Synonyms
  • There is no direct common-language synonym for the scientific term Anostraca.
  • Descriptive Synonyms: "carapace-lacking branchiopods," "swimming branchiopods."
Notes on Meaning

The word Anostraca has a single, precise meaning in zoological taxonomy. It does not have idiomatic or figurative uses. Its definition is stable and refers specifically to the biological order.

Noun
  1. small aquatic crustaceans lacking a carapace: fairy shrimps; brine shrimps

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