What's the difference between bicephalic and bicephalous?

Bicephalic

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Definition:

Example Sentences:

• (1) Their tails, parallel in monocephalic spermatozoa and helicoid in bicephalic spermatozoa, have two complete axonemal axes.
• (2) In a dispatch sent in February 2010, the US ambassador in Moscow, John Beyrle, dubbed the pairing "Russia's bicephalous ruling format".
• (3) In some of the last dispatches released by WikiLeaks, US diplomats correctly predicted that Russia's "bicephalous ruling format" was fizzling out.

Bicephalous

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Definition:

• (a.) Having two heads.

Example Sentences:

• (1) Their tails, parallel in monocephalic spermatozoa and helicoid in bicephalic spermatozoa, have two complete axonemal axes.
• (2) In a dispatch sent in February 2010, the US ambassador in Moscow, John Beyrle, dubbed the pairing "Russia's bicephalous ruling format".
• (3) In some of the last dispatches released by WikiLeaks, US diplomats correctly predicted that Russia's "bicephalous ruling format" was fizzling out.