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Which tropical regions contain caecilian families?

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Zoom in on the serpentine locomotion of the limbless, amphibious caecilian over soil — Gymnophiona Caecilian moving over soil.

Caecilians are found in tropical regions throughout the world. Of the 10 known families, the distribution is as follows:12

The Americas: Home to 5 families.1
Africa and mainland Asia: Each harbor 3 families.1

Additionally, caecilians are found in Indonesia, Sri Lanka, the Philippines, and the Seychelles. While they are present in the Seychelles, they are not found on other islands in the Indian Ocean, nor have they been discovered on New Guinea or Madagascar.1