Relating to or characteristic of the Caenogaea, the modern biogeographical regions of the Earth.
From Caenogaea + -an suffix, forming an adjective to describe modern faunal distributions. Used in biogeographical classification systems developed in the 19th century.
Biogeographers invented these terms to organize how animals spread across the world, recognizing that continents that looked similar might have completely different animals due to geographical separation.
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