Lack nasal passages that open into the throat. Possess sturdy, fleshy lobe-fins Pair of openings in mouth roof leading to external nostrils. Two orders recognized. Devonian to Recent Paired short and muscular fins. Articulation of bones in same arrangement as in subsequent tetrapods.
Paleontologists use anatomical and morphological homologies to trace lineages.
Several recent discoveries have added to our knowledge of early tetrapods. Eucritta has been descibed from Scotland. This fossil appears to combine characteristics of the three different groups. The eye sockets looked bapthetid-like. Amphibians New group retained vestiges of the life habit of predecessors Return to water for reproduction.