Horseshoe Crabs: 445 Million Years Old
Blood Of Horse Shoe Crabs Used To Test Safety Of Vaccines
Crabs: 141 Million Years Old
Crabs belong to the infraorder Brachyura
within the order Decapoda. Their history spans hundreds of millions
of years, evolving through remarkable forms and environments.
Origins:
Crustaceans first appeared in the Cambrian Period
(~500 million years ago).
True crabs (Brachyura) likely evolved during the Jurassic
period (~200 million years ago).
Early crab-like ancestors, such as Eocarcinus, show
up in the fossil record around 190 million years ago.

Crab mentality, describes the mindset of people who try to
prevent others from gaining a favorable position, even if attaining such
position would not directly impact those trying to stop them


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