Brachyura
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
-
an order of crustaceans (including true crabs) having a reduced abdomen folded against the ventral surface
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