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Placodermi

Placodermi Class of archaic, jawed (gnathostome), and heavily armoured fish, which appeared in the Devonian and which were virtually extinct by the end of that period. They were rather diverse in body form. They all possessed a head shield formed by bony plates. Pectoral and pelvic fins appear to have been present. Most of them (e.g. Coccosteus) were bottom-dwelling fish, with a depressed body terminating in a heterocercal tail.

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"Placodermi." A Dictionary of Earth Sciences. . Encyclopedia.com. 12 Dec. 2017 <http://www.encyclopedia.com>.

"Placodermi." A Dictionary of Earth Sciences. . Encyclopedia.com. (December 12, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/placodermi

"Placodermi." A Dictionary of Earth Sciences. . Retrieved December 12, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/placodermi

Placodermi

Placodermi A class of archaic, jawed (gnathostome), and heavily armoured fish, which appeared in the Devonian Period and which were virtually extinct by its end. They were rather diverse in body form. They all possessed a head shield formed by bony plates. Pectoral and pelvic fins appear to have been present. Most of them were bottom-dwelling, with a depressed body terminating in a heterocercal tail.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
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"Placodermi." A Dictionary of Zoology. . Encyclopedia.com. 12 Dec. 2017 <http://www.encyclopedia.com>.

"Placodermi." A Dictionary of Zoology. . Encyclopedia.com. (December 12, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/placodermi-0

"Placodermi." A Dictionary of Zoology. . Retrieved December 12, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/placodermi-0