Radiation of Fish
Devonian rocks have an abrupt abundance of fossil fish. A few, mostly jawless fish, are in layers below the Devonian, but both diversity and abundance are much higher in Devonian rocks.
Placoderms, extinct armored fish, are characteristic of Devonian sediments. They are now extinct.
Several types of lobe-finned fish (Class Sarcopterygii) are found in Devonian rocks, along with ray-finned fish, sharks, and armored fish. The only living lobe-finned fish are lungfish and coelacanths.
Gyroptychius
This predatory fish had short jaws, which enabled a powerful bite.
Eusthenopteron
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Osteolepis with Eyes Sockets
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Coccosteus Long
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Coccosteus
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Ischnacanthus
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Stegotrachelus
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Tristichopterus,
Pentlandia,
& Gyroptychius
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Glyptolepis
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Osteolepis
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Dipterus
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