Because of Enjah's comment creating a sense of nostalgia in me as horseshoe crabs were very common on the beaches of Delaware I was moved to learn more about them. I had never really known anything other than that they were ancient creatures. According to one source, "it is more closely related to spiders, ticks, and scorpions than to true crabs." OK, well, I can see that. Another source says, "Horseshoe crabs are one of the oldest classes of marine arthropods. They are related to extinct water scorpions."

Uh... what? Water scorpions?

It's good it didn't go the other way, i.e. Water scorpions are related to extinct horseshoe crabs, or I'd be an extinct Os, probably.

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