notostraca

Thân thiện

A notostraca swims among aquatic plants in a shallow pond.

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.

Học thuật

Noun

1. small freshwater crustaceans with a shield-shaped carapace

Từ đồng nghĩa

• Notostraca
• order Notostraca