Definition

1. Noun:
   • A bony fish of the subclass Teleostei: A "teleost fish" is a member of the largest and most diverse group of bony fishes, characterized by a symmetrical tail fin and mobile, protrusible jaws. This group includes the vast majority of living fish species.

Usage

• The term "teleost fish" is used in scientific and zoological contexts to classify and describe a specific, dominant group of ray-finned fishes. It is a precise taxonomic term.

Examples

• Noun:
  • The perch, salmon, and tuna are all examples of a teleost fish.
  • The evolution of the swim bladder was a key development for the teleost fish.

Advanced Usage

• In evolutionary biology, the success and diversification of the teleost fish is a major topic of study.
• The term is often used in contrast to more primitive bony fish groups like chondrosteans (e.g., sturgeons) and holosteans (e.g., gars).

Variants and Related Words

• Teleost (noun): A common shortened form of "teleost fish."
  • Most fish you see in an aquarium are teleosts.
• Teleostean (adjective/noun): Pertaining to teleosts; a teleost fish.
  • The teleostean skeleton is highly evolved.

Synonyms

• Bony fish (though this is a broader term that includes non-teleost groups like lungfish and coelacanths).
• Advanced bony fish (a descriptive, non-technical synonym).

Related Phrases/Compounds

• Teleostomi: A larger taxonomic group that includes teleosts and their close relatives.
• Neopterygii: The infraclass that contains teleosts and their immediate evolutionary predecessors.

Noun

1. a bony fish of the subclass Teleostei