Gyracanthus

Gyracanthus is an extinct genus of acanthodian. ...
Found on http://en.wikipedia.org/wiki/Gyracanthus

Gyracanthus

• (n.) A genus of fossil fishes, found in Devonian and carboniferous strata; -- so named from their round, sculptured spines.
Found on http://thinkexist.com/dictionary/meaning/gyracanthus/

Gyracanthus

Gyr`a·can'thus (jĭr`ȧ*kăn'thŭs) noun [ New Latin , from Greek gyro`s round + 'a`kanqa spine.] (Paleon.) A genus of fossil fishes, found in Devonian and carboniferous strata; -- so named from their round, sculptured spines.
Found on http://www.encyclo.co.uk/webster/G/71
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