
Dinichthys herzeri is an extinct, giant, marine arthrodire placoderm from the Late Devonian (Famennian stage) of Ohio and Tennessee. It was comparable in size, shape, and ecological role to the better-known Dunkleosteus. Originally described in 1868 by John Newberry on the basis of an incomplete skull roof and mandibles (AMNH 81), this species rem...
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http://en.wikipedia.org/wiki/Dinichthys

• (n.) A genus of large extinct Devonian ganoid fishes. In some parts of Ohio remains of the Dinichthys are abundant, indicating animals twenty feet in length.
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http://thinkexist.com/dictionary/meaning/dinichthys/

extinct genus of arthrodires, i.e., primitive, armoured, fishlike animals known as placoderms that dominated ancient seas. Dinichthys lived during ... [1 related articles]
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http://www.britannica.com/eb/a-z/d/50

Dinichthys meaning terrible fish), was a family of ancient, meat-eating fishes. Dunkleosteus was the biggest member of this family. It was a heavily armored primitive fish from the Late Devonian period, about 360 million years ago. This top predator was up to 11.5 ft (3.5 m) long and had large, scissor-like cutting jaws with serrated, razor-sharp b...
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http://www.enchantedlearning.com/subjects/dinosaurs/glossary/
Di·nich'thys noun [ New Latin , from Greek ... terrible + ... fish.]
(Paleon.) A genus of large extinct Devonian ganoid fishes. In some parts of Ohio remains of the Dinichthys are abundant, indicating animals twenty feet in length.
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http://www.encyclo.co.uk/webster/D/69
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