Rajidae

Thân thiện

Definition

Noun 1. A family of cartilaginous fish: Rajidae is the taxonomic family name for a large group of rays commonly known as skates. These are bottom-dwelling marine fish characterized by a flattened body, wing-like pectoral fins, and a long, slender tail.

Usage

The word "Rajidae" is used almost exclusively in scientific and zoological contexts to classify and discuss this specific family of fish. - The order Rajiformes includes the family Rajidae. - Biologists studied the egg cases of several species within Rajidae.

Advanced Usage

• In taxonomic hierarchy: The term is used to denote a precise biological classification (Family: Rajidae), sitting between the order (Rajiformes) and the genus level (e.g., ).
  • The common skate, Dipturus batis, belongs to the family Rajidae.

Variants and Related Words

• Rajiform (adj): Relating to the order Rajiformes, which includes the family Rajidae.
  • Rajiform fishes have a distinct body shape.
• Skate (n): The common name for most species within the family Rajidae.
  • We caught a small skate while fishing.
• Ray (n): A broader term for elasmobranch fish in the superorder Batoidea, which includes skates (Rajidae), stingrays, electric rays, and others.
  • Rays and skates are often confused.

Synonyms

• Skates (common name)
• Hardnose skates (a descriptive common name for some members)

Notes on Meaning

• Scientific vs. Common Usage: "Rajidae" has a single, precise scientific meaning. It is not used in everyday conversation. The common term is "skates."
• Distinction from Stingrays: While both are rays, members of Rajidae (skates) typically have a fleshier tail without a venomous spine and lay eggs (mermaid's purses), whereas stingrays often have a whip-like tail with a spine and give live birth.

Học thuật

Noun

1. bottom-dwelling tropical rays: skates

Từ đồng nghĩa

• Rajidae
• family Rajidae