subclass Holocephali

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Definition
  1. Noun:
    • A taxonomic subclass of cartilaginous fish: "Subclass Holocephali" is a scientific classification for a group of fish characterized by having the upper jaw fused to the skull, a single gill opening on each side, and no scales. This group includes modern chimaeras (ratfish) and their extinct relatives.
Usage Examples
  • Noun:
    • The subclass Holocephali is distinct from sharks and rays within the class Chondrichthyes.
    • Fossil evidence shows that the subclass Holocephali was more diverse in the past.
Advanced Usage
  • In taxonomic hierarchy: The term is used in formal biological classification to denote a specific rank (subclass) within the class Chondrichthyes (cartilaginous fish).
    • The phylogenetic study aimed to clarify the position of the subclass Holocephali.
Variants and Related Words
  • Holocephali (noun): Often used interchangeably with "subclass Holocephali" in less formal scientific contexts.
    • Holocephali diverged from elasmobranchs a long time ago.
  • Holocephalian (adjective/noun): Relating to this subclass; a member of this subclass.
    • The holocephalian fossil was remarkably well-preserved.
Synonyms
  • Chimaeroids: A less formal term referring to the modern members of this group.
  • Ratfish group: A common name-based reference.
Related Phrases
  • "Member of the Holocephali": A phrase used to describe an organism belonging to this subclass.
    • This extinct species was a member of the Holocephali.
Noun
  1. chimaeras and extinct forms

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