Gymnophiona is the group of amphibians that includes the legless caecilians and all amphibians more closely related to them than to frogs or salamanders (the "stem-caecilians"). The name derives from the Greek words ("gymnos", naked) and ("ophis", snake), as the caecilians were originally thought to be related to snakes.

Based on that paragraph can we conclude that this sentence is true?
Caecilians were originally snakes.
It's impossible to say