Notostraca

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Definition

Noun 1. An order of small freshwater crustaceans: Notostraca refers to a taxonomic order of branchiopod crustaceans commonly known as tadpole shrimp. They are characterized by a broad, shield-shaped carapace that covers much of the body and a long, segmented abdomen.

Usage
  • The order Notostraca includes some of the most ancient living crustaceans.
  • Fossils indicate that Notostraca have existed for hundreds of millions of years.
  • Biologists study Notostraca to understand evolutionary adaptations in freshwater environments.
Advanced Usage
  • In scientific taxonomy: The term is used formally to classify organisms within the class Branchiopoda. It is often contrasted with other orders like Anostraca (fairy shrimp) and Cladocera (water fleas).
    • The specimen was definitively placed within the order Notostraca based on its morphological features.
Variants and Related Words
  • Notostracan (noun/adjective): A member of the order Notostraca; relating to this order.
    • The notostracan carapace is a key identifying feature.
  • Tadpole shrimp (common name): The widely used common name for crustaceans in the order Notostraca.
Synonyms
  • Tadpole shrimp
Related Terms & Context
  • Branchiopoda: The class to which Notostraca belongs.
  • Carapace: The hard dorsal shield, a defining characteristic of Notostraca.
  • Triops: A well-known genus within the order Notostraca, often sold in educational kits.
  • Living fossil: A descriptive term sometimes applied to Notostraca due to their long evolutionary history with little morphological change.
Noun
  1. small freshwater crustaceans with a shield-shaped carapace

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