[dangus]

Actually, I think the closest living relative to a trilobite is probably a horseshoe crab. They are placed with arachnids (spiders, etc.), but I think that being more basal (ancient), they are more similar to other basal organisms than more highly evolved arachnids.

[Reily]

Yeah I think you’re right.

Trilobites are among my favorite fossils!
Always loved finding them and collecting them.
They’re so varied!

[EinNYC]

Actually, I think the closest living relative to a trilobite is probably a horseshoe crab. They are placed with arachnids (spiders, etc.), but I think that being more basal (ancient), they are more similar to other basal organisms than more highly evolved arachnids. If you turn a horseshoe crab over, you will see its jointed legs and thus its relation to spiders. I also think it's a relative of trilobites. The resemblance cannot be denied.