Matches in DBpedia 2014 for { ?s ?p The evolution of fish is not studied as a single event since fish do not represent a monophyletic group. Fish first appeared during the Cambrian explosion, around 530 million years ago (Ma). Early fish from the fossil record are represented by a group of small, jawless, armoured fish known as ostracoderms. Jawless fish lineages are mostly extinct. An extant clade, the lampreys may approximate ancient pre-jawed fish. The first jaws are found in Placoderm fossils. The diversity of jawed vertebrates may indicate the evolutionary advantage of a jawed mouth. It is unclear if the advantage of a hinged jaw is greater biting force, improved respiration, or a combination of factors.. }
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- Evolution_of_fish abstract "The evolution of fish is not studied as a single event since fish do not represent a monophyletic group. Fish first appeared during the Cambrian explosion, around 530 million years ago (Ma). Early fish from the fossil record are represented by a group of small, jawless, armoured fish known as ostracoderms. Jawless fish lineages are mostly extinct. An extant clade, the lampreys may approximate ancient pre-jawed fish. The first jaws are found in Placoderm fossils. The diversity of jawed vertebrates may indicate the evolutionary advantage of a jawed mouth. It is unclear if the advantage of a hinged jaw is greater biting force, improved respiration, or a combination of factors.".