Definition

1. Noun:
   • A taxonomic family of primitive sharks: "Family Hexanchidae" refers to a specific biological family within the order Hexanchiformes, comprising sharks considered evolutionarily primitive, such as cow sharks and sixgill sharks. These sharks are characterized by having either six or seven gill slits, unlike most other sharks which have five.

Usage Examples

• Noun:
  • The frilled shark, with its six gill slits, is a member of the family Hexanchidae.
  • Biologists study the family Hexanchidae to understand early shark evolution.

Advanced Usage

• In taxonomic context: Used formally in scientific literature and classification.
  • The specimen was classified under the family Hexanchidae based on its skeletal morphology and gill slit count.

Variants and Related Words

• Hexanchid (noun/adjective): A shark belonging to the family Hexanchidae; of or relating to this family.
  • The hexanchid species are often found in deep waters.

Synonyms

• Cow sharks (common name for members of this family).
• Sixgill and sevengill sharks (descriptive terms for members).

Related Terms

• Hexanchiformes (noun): The biological order to which the family Hexanchidae belongs.
• Chlamydoselachidae (noun): Another primitive shark family (containing the frilled shark) sometimes grouped with or related to Hexanchidae.

Noun

1. primitive sharks