hexanchidae

Thân thiện

A scientist sketches a Hexanchidae fossil in a museum.

Definition

1. Noun:
   • A family of primitive sharks: "Hexanchidae" is the scientific family name for a group of sharks considered evolutionarily primitive, characterized by having six or seven gill slits, a single dorsal fin, and an anal fin.

Usage Examples

• Noun:
  • The Hexanchidae family includes species like the cow shark and the frilled shark.
  • Fossil records show that Hexanchidae have existed for millions of years.

Advanced Usage

• In taxonomic context: Used specifically in scientific classification (zoology, marine biology) to denote this particular family within the order Hexanchiformes.
  • The specimen was classified under Hexanchidae based on its distinct gill slit count.

Variants and Related Words

• Hexanchiform (adj): Relating to the order Hexanchiformes, which includes the family Hexanchidae.
  • The hexanchiform body plan is considered very ancient.
• Cow shark (n): A common name for some members of the Hexanchidae family.
• Frilled shark (n): Another common name for a species () within Hexanchidae.

Synonyms

• Cow sharks (common name)
• Sixgill and sevengill sharks (descriptive term)

Related Phrases

• Primitive shark family: A descriptive phrase often used to explain Hexanchidae.
  • The Hexanchidae are a primitive shark family with unique anatomical features.

Học thuật

Noun

1. primitive sharks

Từ đồng nghĩa

• Hexanchidae
• family Hexanchidae