This kinship is supported by aquatic adaptations that we found shared by Tetrapodophis, Pachyrhachis and sea lizards. All of this is consistent with the view that snakes evolved from aquatic lizards, losing their legs and elongating their bodies for eel-like swimming.

What animal did snakes evolve from?

We know from their shared anatomy that snakes evolved from lizards. We also know that the skulls of snakes have been key to their successful and highly specialized feeding adaptations. New Najash fossil skulls would be highly informative on the pattern of snake skull evolution.

Is eel related to snake?

Are eels related to sea snakes? Judging by their anatomy, definitely not. Eels are actually fish (albeit typically longer) and are flatter than snakes. ... Meanwhile, sea snakes are indeed snakes—reptiles, just like the non-marine varieties—that are only found in marine environments.