cephalaspid

Thân thiện

A cephalaspid swims near the bottom of an ancient sea.

Definition

1. Noun:
   • An extinct jawless fish of the Devonian period with an armored head: A "cephalaspid" is a type of prehistoric, jawless vertebrate characterized by a bony shield covering its head. It belongs to an extinct group of fish known as ostracoderms.

Usage Examples

• Noun:
  • The fossil record shows that the cephalaspid was a common bottom-dweller in Devonian seas.
  • Paleontologists studied the distinctive head shield of the cephalaspid to understand early vertebrate evolution.

Advanced Usage

• Scientific Classification: The term is often used in paleontological and evolutionary biology contexts to refer to members of the order Cephalaspida.
  • The cephalaspid lineage provides crucial insights into the development of the vertebrate skull.

Variants and Related Words

• Cephalaspida (n): The taxonomic order to which cephalaspids belong.
  • Cephalaspida is an order of extinct, armored jawless fish.
• Ostracoderm (n): A broader term for extinct, armored, jawless fish, which includes cephalaspids.
  • Cephalaspids are a specific type of ostracoderm.

Synonyms

• Armored jawless fish: A descriptive synonym highlighting its key features.
• Ostracoderm: A related, more general term for similar extinct fish.

Related Phrases / Idioms

(This word is a specific scientific term and is not commonly used in idiomatic expressions or phrasal verbs.)

Học thuật

Noun

1. extinct jawless fish of the Devonian with armored head

Từ đồng nghĩa

• osteostracan