ascaphidae

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Definition

Proper noun 1. A taxonomic family of frogs: Ascaphidae is a family of frogs containing a single living genus, Ascaphus. This family is characterized by a unique "tail" (actually an extension of the cloaca) present in males, an adaptation for internal fertilization in fast-flowing streams. They are considered among the most primitive of living frogs.

Usage
  • The Ascaphidae are of great interest to biologists studying amphibian evolution.
  • The family Ascaphidae is represented by only two extant species, the coastal and Rocky Mountain tailed frogs.
Advanced Usage
  • In taxonomic context: The name is always capitalized as it is a proper noun referring to a specific biological family. It is often used in scientific literature discussing amphibian phylogeny or primitive anuran characteristics.
    • The morphological features place it firmly within the Ascaphidae.
Variants and Related Words
  • Ascaphus (proper noun): The sole genus within the family Ascaphidae.
  • tailed frog (noun): The common name for frogs of the genus and family Ascaphidae.
  • Leiopelmatidae (proper noun): A closely related family of primitive frogs (New Zealand's Leiopelma) sometimes grouped with Ascaphidae in the superfamily Ascaphoidae.
Synonyms
  • family Ascaphidae (noun): The full taxonomic designation.
Related Terms (Biological Context)
  • Anura (proper noun): The order of tailless amphibians to which Ascaphidae belongs.
  • primitive frog (noun phrase): A descriptive term often applied to members of this family due to retained ancestral traits like vestigial tail-wagging muscles and primitive vertebrae.
Noun
  1. family of one species of frog: tailed frog

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