Definition

Noun 1. A former taxonomic order of fish: "Isospondyli" is an obsolete scientific classification for a large group of primitive, soft-rayed teleost (bony) fish. This group historically included many important food and game fish characterized by having simple, soft fin rays and certain skeletal features.

Usage Examples

• Noun:
  • The order Isospondyli included families like Salmonidae and Clupeidae.
  • Modern taxonomy has largely replaced the classification Isospondyli with more precise groupings.

Advanced Usage

• Scientific/Historical Context: The term is primarily used in historical or specialized texts discussing the evolution of fish taxonomy. It is not used in modern biological classification but is important for understanding the history of ichthyology (the study of fish).

Variants and Related Words

• Isospondylous (adj): Describing fish that belong to or have the characteristics of the former order Isospondyli.
  • The herring is an isospondylous fish.

Synonyms

• Clupeiformes (n): In modern taxonomy, this is one of the orders (containing herrings, sardines, anchovies) that was formerly part of Isospondyli.
• Salmoniformes (n): In modern taxonomy, this is one of the orders (containing salmon, trout, whitefish) that was formerly part of Isospondyli.
• Soft-rayed fishes (n): A descriptive, non-taxonomic term referring to the physical characteristic shared by these fish.

Related Terms & Context

• Teleostei (n): The large infraclass that contains all modern bony fish, including the groups formerly classified as Isospondyli.
• Ostariophysi (n): Another major group of teleost fish, distinct from the isospondylous fishes, often including carps and catfish.

Noun

1. most primitive teleost fishes; all are soft-finned: salmon; trout; herring; shad; sardines; anchovies; whitefish; smelts; tarpon