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RE: Seeing Through The Trilobite's Eyes: Strategies of History's Most Successful Animal
Thanks for teaching me something about trilobites I din't know.
Do we know if their blood was cuprous, like horseshoe crabs?
It's certainly possible- the use of hemocyanin instead of hemoglobin is common enough amongst crustaceans. There have been several studies of trace elements in lagerstatten preserved fossils that indicate it is likely they did. We don't know for sure, though.