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extinct small freshwater jawless fish usually having a heterocercal tail and an armored head; of the Silurian and Devonian anaspid
extinct jawless fish of the Devonian with armored head cephalaspid , osteostracan
fossil gymnospermous trees or climbing plants from the Devonian: seed ferns Cycadofilicales , Lyginopteridales , order Cycadofilicales , order Lyginopteridales
lower tracheophytes in existence since the Devonian Equisetales , order Equisetales
Devonian fossil plant considered one of the earliest forms of vascular land plants; similar to genus Rhynia but smaller genus Horneophyton , Horneophyton
earliest fossil amphibian ever found; of the Devonian; found in Pennsylvania genus Hynerpeton , Hynerpeton
second earliest fossil amphibian ever found; of the Devonian; found in Greenland genus Ichthyostega
extinct jawless fish with the anterior part of the body covered with bony plates; of the Silurian and Devonian heterostracan
fossil amphibian of the Devonian having well-developed forelimbs; found in Pennsylvania Hynerpeton bassetti
extinct amphibians typically resembling heavy-bodied salamanders or crocodiles and having a solid flattened skull and conical teeth; Devonian through Triassic Labyrinthodonta , Labyrinthodontia , superorder Labyrinthodonta , superorder Labyrinthodontia
fossil arborescent plants arising during the early Devonian and conspicuous throughout the Carboniferous Lepidodendrales , order Lepidodendrales
fishlike vertebrate with bony plates on head and upper body; dominant in seas and rivers during the Devonian; considered the earliest vertebrate with jaws placoderm
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