Selkirkia was a priapulid worm that first appeared in the Cambrian explosion.

Selkirkia in "Worlds Enough, and Time" Edit

Selkirkia was one of several animals in an aquarium that a family of space travelers brought with them on their vacation to Earth. Despite the father's misgivings, he allowed his daughter to empty the aquarium into the oceans, thereby spurring an explosion of life.

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