caudal fin
Definition
Noun: - The tail fin of a fish or other aquatic vertebrate, located at the posterior end of the body. It is the primary appendage used for propulsion, providing the powerful thrust needed for swimming.
Usage
The term "caudal fin" is used specifically in zoology and ichthyology to describe the anatomical structure. It is a countable noun. - The shark's powerful caudal fin propels it through the water at high speed. - Biologists study the shape of the caudal fin to understand a fish's swimming style.
Advanced Usage
- Heterocercal caudal fin: A fin where the vertebral column extends into the upper lobe, making it asymmetrical (common in sharks and sturgeons).
- The heterocercal caudal fin provides lift as well as thrust.
- Homocercal caudal fin: A fin that appears symmetrical externally, with equal-sized lobes (common in most bony fish).
- A tuna's homocercal caudal fin is highly efficient for sustained swimming.
Variants and Related Words
- Tail fin: A more general, common term for the caudal fin.
- Caudal peduncle: The narrow part of a fish's body to which the caudal fin is attached.
Synonyms
- Tail fin
- Tail
Related Phrases/Idioms
(This specific anatomical term is not commonly used in idiomatic expressions.)
Noun
-
the tail of fishes and some other aquatic vertebrates
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