holocephali

Thân thiện

A scientist carefully studies a fossil of a holocephali in the museum.

Definition

1. Noun:
   • A subclass of cartilaginous fish: "Holocephali" is the scientific name for a taxonomic subclass of fish that includes the chimaeras (also known as ghost sharks, ratfish, or rabbitfish) and their extinct relatives. They are characterized by having a single gill opening covered by an operculum (a flap of skin), upper jaws that are fused to the skull, and teeth that are fused into plates.

Usage Examples

• Noun:
  • The Holocephali diverged from other chondrichthyans, like sharks, a very long time ago.
  • Fossil evidence shows that the subclass Holocephali was once much more diverse.
  • Biologists study the Holocephali to understand the evolution of jawed vertebrates.

Advanced Usage

• In taxonomic context: The term is always capitalized when referring to the formal subclass rank.
  • The order Chimaeriformes falls within the subclass Holocephali.

Variants and Related Words

• Holocephalan (n): An individual member of the Holocephali.

  • The spotted ratfish is a common holocephalan found in the Pacific Ocean.

• Chimaera (n): The common name for living members of the Holocephali.

  • The chimaera is a deep-sea dweller with a venomous spine.

Synonyms

• Chimaeroids: A less common synonym referring to the group.
• Ghost sharks: A common name for some living species.
• Ratfish: A common name for some living species.

Related Phrases

• Subclass Holocephali: The full taxonomic designation.
  • The subclass Holocephali is part of the class Chondrichthyes.

Related Idioms

(This is a highly specific scientific term, so it does not have common idiomatic expressions associated with it.)

Học thuật

Noun

1. chimaeras and extinct forms

Từ đồng nghĩa

• Holocephali
• subclass Holocephali