genus ichthyostega: second earliest fossil amphibian ever found; of the Devonian; found in Greenland
amphibian genus: any genus of amphibians
hamamelidae: a group of chiefly woody plants considered among the most primitive of angiosperms; perianth poorly developed or lacking; flowers often unisexual and often in catkins and often wind pollinated; contains 23 families including the Betulaceae and Fagaceae (includes the Amentiferae); sometimes classified as a superorder