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Answer for the clue "In former classifications a division of Amphibia comprising all pre-Jurassic and some later extinct large salamandriform amphibia ", 13 letters:
stegocephalia

Word definitions for stegocephalia in dictionaries

Wikipedia Word definitions in Wikipedia
Stegocephalia is a name used for four-limbed stem-tetrapods , and their amphibian - grade descendants, and in phylogenetic nomenclature for all tetrapods . The term was coined in 1868 by American palaentologist Edward Drinker Cope and comes from Greek στεγοκεφαλια ...

Usage examples of stegocephalia.

Springing, I hazard, from the stegocephalia, the ancestor of the frogs, these batrachians followed a different line of evolution and acquired the upright position just as man did his from the four-footed folk.

There is therefore strong reason for tracing the Caecilians directly from the Stegocephalia, as was the view of T.