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acanthodian

[ak-uh n-thoh-dee-uh n] /ˌæk ənˈθoʊ di ən/
noun
1.
any small, spiny-finned, sharklike fish of the extinct order Acanthodii, from the Paleozoic Era.
Origin
1850-1855
1850-55; < Neo-Latin Acanthodi(i) plural of acanthodius (equivalent to Acanthod(es) a genus (< Greek akanthṓdēs prickly, spiny; see acanth-, -ode1) + Latin -ius) + -an
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Article for acanthodian

any of a class (Acanthodii) of small extinct fishes, the earliest known jawed vertebrates, possessing features found in both sharks and bony fishes. Acanthodians appeared first in the Silurian Period and lasted into the Early Permian (from about 438 to 258 million years ago).

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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