A pantropical ("all tropics") distribution is one which covers tropical regions of both hemispheres. Examples include caecilians, modern sirenians and the plant genera Acacia and Bacopa.
Neotropical is a zoogeographic term that covers a large part of the Americas, roughly from Mexico and the Caribbean southwards (including cold regions in southernmost South America).
Palaeotropical refers to geographical occurrence. For a distribution to be palaeotropical a taxon must occur in tropical regions in the Old World.
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