Definition

Noun: 1. A taxonomic order of fish: "order Anguilliformes" is the scientific name for the biological order comprising true eels. These are elongated, snake-like fish characterized by the absence or significant reduction of pelvic fins and their supporting girdle.

Usage

• Scientific Classification: Used primarily in biological and zoological contexts to classify a specific group of fish.
  • The European eel (Anguilla anguilla) belongs to the order Anguilliformes.
  • Marine biologists study the life cycle of species within the order Anguilliformes.

Advanced Usage

• In Taxonomic Hierarchy: The term is used to denote a rank (order) within the scientific classification system (taxonomy), sitting below the class Actinopterygii (ray-finned fish) and above the family (e.g., Anguillidae, Muraenidae).
  • The fossil record provides clues about the early evolution of the order Anguilliformes.

Variants and Related Words

• Anguilliform (adjective): Having the form or characteristics of an eel; relating to the order Anguilliformes.
  • The anguilliform body shape is adapted for burrowing and swimming through crevices.
• Eel (noun): The common name for a fish belonging to the order Anguilliformes.
  • Moray eels and freshwater eels are both members of this order.

Synonyms

• Apodes: An older, synonymous taxonomic name for this order, derived from Greek meaning "without feet," referring to the lack of pelvic fins.

Noun

1. elongate fishes with pelvic fins and girdle absent or reduced