Holocephali
Definition
- 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.)
Noun
-
chimaeras and extinct forms
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