Brachyura

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Definition

Noun: 1. A scientific order of decapod crustaceans: Brachyura is the taxonomic infraorder comprising the "true crabs." These crustaceans are characterized by a short, broad carapace (shell) and, most distinctly, a greatly reduced abdomen that is typically folded and held tightly against the ventral surface (underside) of the body.

Usage Examples
  • Noun:
    • The infraorder Brachyura includes familiar species like the blue crab and the Japanese spider crab.
    • Marine biologists study the evolution and diversity within Brachyura.
Advanced Usage
  • In taxonomic classification: The term is used formally in scientific literature to categorize and discuss this specific group of crustaceans.
    • The fossil record suggests that Brachyura diverged from other decapods during the Jurassic period.
Variants and Related Words
  • Brachyuran (noun/adjective): A member of the Brachyura; of or relating to the Brachyura.
    • The brachyuran's abdomen is hidden beneath its thorax. (adjective)
    • This specimen is a brachyuran. (noun)
Synonyms
  • True crabs: The common name for members of the infraorder Brachyura.
  • Short-tailed crabs: A descriptive name referencing the reduced abdomen.
Related Terms (Contextual)
  • Decapoda: The larger order to which Brachyura belongs, which also includes shrimp, lobsters, and hermit crabs.
  • Anomura: The infraorder of "false crabs" or crab-like decapods (e.g., hermit crabs, king crabs), often contrasted with Brachyura.
  • Abdomen: The posterior part of the body, which is reduced and folded in brachyurans.
  • Carapace: The hard dorsal (upper) shell.
Noun
  1. an order of crustaceans (including true crabs) having a reduced abdomen folded against the ventral surface

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