What's the difference between diphycercal and homocercal?

Diphycercal

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Definition:

• (a.) Having the tail fin divided into two equal parts by the notochord, or end of the vertebral column; protocercal. See Protocercal.

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Homocercal

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Definition:

• (a.) Having the tail nearly or quite symmetrical, the vertebral column terminating near its base; -- opposed to heterocercal.

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