order isospondyli
Học thuậtThân thiện
The scientist carefully studies a preserved specimen of the order Isospondyli.
Definition
Noun: 1. A taxonomic order of primitive teleost fishes: "Order Isospondyli" refers to a former taxonomic classification for a large group of primitive, soft-rayed bony fishes. This group is characterized by having simple, unbranched fin rays and includes many commercially and ecologically important fish families.
Usage
- The term is used in scientific, historical, or taxonomic contexts to discuss the classification of certain primitive fish.
- : The herring and the salmon were once grouped together within the order Isospondyli.
Advanced Usage
- Historical Taxonomy: In modern cladistic classification, the group "Isospondyli" is considered paraphyletic and is no longer formally recognized as a valid order. The families it contained are now distributed among other orders.
- : While order Isospondyli appears in older literature, contemporary ichthyology places its members into orders like Clupeiformes and Salmoniformes.
Variants and Related Words
- Isospondylous (adj): Pertaining to or characteristic of the former order Isospondyli.
- Example: The fossil exhibited isospondylous vertebral structures.
Synonyms
- Malacopterygii (noun, historical): An older, synonymous term for a similar grouping of soft-finned fishes.
- Soft-rayed fishes (noun, descriptive): A common name describing the primary physical characteristic of these fish.
Notes on Meaning
- The definition refers specifically to a taxonomic order. It is a scientific label, not a common name for a single type of fish.
- The core meaning encompasses the shared primitive anatomical features (like simple fin rays) of the included families, such as herring, salmon, trout, and anchovies.
The scientist carefully studies a preserved specimen of the order Isospondyli.
Noun
- most primitive teleost fishes; all are soft-finned: salmon; trout; herring; shad; sardines; anchovies; whitefish; smelts; tarpon