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Horseshoe crabs
Horseshoe crabs
Limulidae
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Xiphosurida
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Horseshoe crab - Wikipedia
https://en.wikipedia.org/wiki/Horseshoe_crab
Horseshoe crabs
They Put the Bite in Trilobite - The New York Times
https://www.nytimes.com/2021/01/30/science/trilobites-shells-fossils.html
Cambrian period
Horseshoe crabs
Olenoides serratus
Redlichia
Redlichia rex
Sidneyia inexpectans
Trilobites