Definition

Proper noun A taxonomic family of primitive ray-finned fish, commonly known as paddlefishes, characterized by elongated, paddle-like snouts (rostrums) and largely cartilaginous skeletons. They are freshwater fish found primarily in large river systems.

Usage

"Family Polyodontidae" is used in formal, scientific contexts such as biology, zoology, and taxonomy to classify and refer to this specific group of fish. It is typically preceded by the taxonomic rank "family."

Examples

• The family Polyodontidae contains only two extant species.
• Fossils indicate that the family Polyodontidae was once more widespread.
• Biologists are studying the evolutionary history of the family Polyodontidae.

Advanced Usage

• In phylogenetic studies, the family Polyodontidae is often discussed in relation to other primitive fish families within the order Acipenseriformes.

Variants and Related Words

• Polyodontidae: The standard form, often used without "family" in technical writing.
• Polyodontid (noun): A member of the family Polyodontidae; a paddlefish.
  • Example: Several polyodontid fossils were discovered in the shale.
• Paddlefish (noun): The common name for fish in this family.
  • Example: The American paddlefish is a filter feeder.

Synonyms

• Paddlefishes (common name)

Notes

This term is highly specialized. In non-scientific contexts, the common name "paddlefishes" is always preferred. The family is notable for containing living representatives of an ancient lineage.

Noun

1. paddlefishes