Britannica Sources used in this answer

Which caecilian species is the largest known?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

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

The largest known caecilian species is Caecilia thompsoni, which can reach a length of 1.5 metres (about 5 feet).12

These caecilians belong to the order Gymnophiona, a group of specialized, limbless, and often fossorial (burrowing) amphibians found primarily in humid tropical regions.23