Is there any consensus as to the internal organs/stuff which maybe doesn’t fossilize well? Like, did they just evolve a bitchin’ chassis but they’re constantly tinkering with the internal bits?
In truth, the modern horsehoe crab is different than its ancestors, just not as much as usually occurs in several hundred million years. So Frank was really more like, “Eh, maybe a little, but not much.”
Fossilisation has a bit more to do with deposition conditions than the creature itself. It’s why we know next to nothing about jungle dinosaurs and ones around mountains. Most of our knowledge comes from marine and wetland dinos.
They shouldn’t have evolved blood that’s useful to humans, really pretty short sighted of them
makes toxic-bacteria-detecting blood like a boss
