Flatworm

But you can also learn something about an animal's lineage by comparing plesiomorphies, very basic traits that are shared by animals with a common ancestry.

So between the Platyhelminthes and the Nematodes and the Annelids, one plesiomorphy is that they're all worm-shaped, which tells you that they have a common distant ancestor that was wormy looking.

So as we talk about these phyla and the classes within them, notice how they're similar and different from each other.

For instance, within Annelida, there are three different classes.

by the Gliders, three-piece.

Then I've got the Flatworms from LA, been around for a long time, Into the Iris.

I've got Gnod, I think that's how you pronounce it.

It's a UK band, four-piece.