Relating to or found in both hemispheres of the Earth.
From 'amphigaea' with adjectival suffix '-an'. Used in geographical and biological contexts from the 18th-19th centuries.
Biologists would use 'amphigaean distribution' to describe species found on both sides of the world—but modern DNA shows some of these patterns are recent human-aided distributions rather than ancient natural ranges, revealing how plant and animal ranges have been reshuffled by humans.
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