Chondrichthyes
Definition
Noun (used with a singular or plural verb) A class of jawed fish whose skeletons are primarily composed of cartilage rather than bone. This class includes sharks, rays, skates, and chimaeras.
Usage
The word "Chondrichthyes" is a scientific, taxonomic term. It is typically used in formal, academic, or biological contexts when classifying or discussing this specific group of fish. * In biological classification, "Chondrichthyes" is the class name. * It is often used in contrast to "Osteichthyes," the class of bony fish.
Examples
- Sharks and rays both belong to the class Chondrichthyes.
- The evolutionary history of Chondrichthyes extends back hundreds of millions of years.
- A key characteristic of Chondrichthyes is the presence of placoid scales (denticles).
Advanced Usage
- The term can be used attributively (like an adjective) in compound nouns to specify a type within this class.
- Chondrichthyan fish are often apex predators in their ecosystems.
- The study focused on chondrichthyan embryology.
Variants and Related Words
- Chondrichthyan (noun/adjective): A member of the class Chondrichthyes; pertaining to this class.
- The museum has a superb collection of fossil chondrichthyans.
- Elasmobranchii: A subclass within Chondrichthyes that includes sharks, rays, and skates.
- Holocephali: A subclass within Chondrichthyes that includes chimaeras (ratfish, ghost sharks).
Synonyms
- Cartilaginous fishes (This is the direct, descriptive synonym in common language).
- Elasmobranchs (This is a common but technically narrower term, as it usually excludes chimaeras).
Word Origin and Notes
- Etymology: From Greek meaning "cartilage" and meaning "fish."
- Note: As a formal taxonomic name, it is often capitalized: Chondrichthyes.
Noun
-
cartilaginous fishes
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