Worm-like fossil is the oldest ancestor of spiders and crustaceans
Arthropods belong to an evolutionary branch – the ecdysozoa – that contains about half of all animal species, and the earliest fossil evidence of the group dates back 550 million years
Arthropods belong to an evolutionary branch – the ecdysozoa – that contains about half of all animal species, and the earliest fossil evidence of the group dates back 550 million years
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