/ Thesaurus / G Synonyms of genus ichthyostega Find synonyms for: Noun1. genus Ichthyostega, amphibian genususage: second earliest fossil amphibian ever found; of the Devonian; found in GreenlandWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: foliage Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language