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Acanthodii

Acanthodii (acanthodians) Class of primitive, fossil fish, characterized by the presence of a true bony skeleton (see BONE), a heterocercal tail fin, a persistent notochord, ganoid scales, and stout spines in front of the fins. The acanthodians lived from the Silurian to the Permian Period and may be related to ancestors of the more modern bony fish.

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"Acanthodii." A Dictionary of Earth Sciences. . Retrieved May 24, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/acanthodii

Acanthodii

Acanthodii Class of primitive, fossil fish that had a true bony skeleton, a heterocercal tail fin, a persistent notochord, ganoid scales, and stout spines in front of the fins. The acanthodians lived from the Silurian Period to the Permian Period and may be related to ancestors of the more modern bony fish.

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"Acanthodii." A Dictionary of Zoology. . Encyclopedia.com. 24 May. 2017 <http://www.encyclopedia.com>.

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"Acanthodii." A Dictionary of Zoology. . Retrieved May 24, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/acanthodii-0

acanthodians

acanthodians See ACANTHODII.

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"acanthodians." A Dictionary of Earth Sciences. . Encyclopedia.com. 24 May. 2017 <http://www.encyclopedia.com>.

"acanthodians." A Dictionary of Earth Sciences. . Encyclopedia.com. (May 24, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/acanthodians

"acanthodians." A Dictionary of Earth Sciences. . Retrieved May 24, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/acanthodians