Usernames you might have used?

[Anomalocaris]

^ Are they early life forms too?

Yes.  

Wiwaxia is an very early bottom dweller that looks like a small ball clad in scale armor, with spikes protruding from its back,  it’s relationship with other animals are not unclear.

Opabinia looks vaguely like an anomalocaris, but instead of being bilaterally symmetrical with two grasping appendages under its head, it has just one enormous (compared to the animal) appendage with something that vaguely resembles a lobster pincer at its tip. But the resemblance must be superficial because the great appendage apparently has no hard exoskeleton, and works using a system of internal hydraulic pressure.
It’s resemblance in other respects to anomalocaris May signify evolutionary kinship, or it may reflect comvergent evolution.  The jury is still out. Like anomalocaris, it seem to have enough of the characteristics which paleontologist deduced to have been present in the as yet undiscovered last common ancester between all arthropods (insects, crabs, spiders, trilobites, etc), it is considered to be a reasonably closely related to the earliest arthropods, but is not considered to be a direct ancester of arthropods.

Pikaia is the earliest known example of an animal with the beginnings of a backbone.  It also share other commonalities such a musculature patterns with very primitive fish.  As such it is believed to be fairly closely related to the earliest members of the lineage from which we humans will eventually descend.