Earliest known ancestors of scorpions were tiny sea beasts
Briefly

Fossils of what is now known as S. abundantis have been found early on...However, this creature wasn't studied in detail before simply because scientists focused on other taxa first.
the origin of chelicerates has been one of the most tangled knots in the arthropod tree of life, as there has been a lack of fossils between 503 to 430 million years ago.
Read at Ars Technica
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