| http://www.w3.org/ns/prov#value | - Certain crossopterygian (sarcopterygian) fishes of the family Panderichthyidae are so similar to the earliest amphibians, Ichthyostega and Acanthostega, that, in some instances, it is difficult to tell if a fossil is a fish or an amphibian (Ahlberg, 1991; Ahlberg and Milner 1994.) Acanthostega had fishlike internal gills and ventilation.
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