Greetings to all

I am a big fan of sci-fi films, games, and books.
When I was a child, I saw a sci-fi animated film but I can't remember how it's called, and what is the plot.

The only scene that I remember:
A man in a space suit explores an "Mars" like planet, while in a deep cavern, he stumbles upon an alien.
The alien is white, and if I remember correctly several long snake like head, but without eyes and teeth.
The alien attacks the man, and from it's mouth several other jaws appear and start to snap while approaching closer and closer to his face.

The film may be from the early 1980 or even earlier.
The animation looks similar to:

Gandahar
https://en.wikipedia.org/wiki/Gandahar_%28film%29

Les Maîtres du temps (The Masters of Time)
https://en.wikipedia.org/wiki/Les_Ma%C3%AEtres_du_temps

Thank you
gogwitcher300