The first flatworms, or platyhelminthes, probably evolved from something like a hydra about 550 million years ago.

How long have flatworms been around?

The earliest known fossils confidently classified as tapeworms have been dated to 270 million years ago, after being found in coprolites (fossilised faeces) from an elasmobranch.

Did humans come from flatworms?

Flatworms Are Oldest Living Ancestors To Those Of Us With Right And Left Sides, Researchers Report In Science.