Notostraca
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
-
small freshwater crustaceans with a shield-shaped carapace
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