Horseshoe theory
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Why aren't these things considered Trilobites exactly? They look like Trilobites and I'm pretty sure they fill some of the same general niches? Is it just a taxonomical thing? Are they just not in the right clade?
https://a-z-animals.com/blog/trilobite-vs-horseshoe-crab-what-are-the-differences/
This reads like it was written by an LLM
If it quacks like a LLM ...
Not in the right clade, basically.
They look similar, but aren't directly related. It's similar to why legless lizards aren't snakes, and bats aren't birds.
But snakes are legless lizards. Link to youtube
Edit: Wrong link, I'll leave the previous one anyways because it's also fun https://youtu.be/_5jNZyoSszE
Fair. I should have said that many legless lizards aren't snakes.