Tag Archives: Idmon

305-Million-Year-Old ‘Almost Spider’ Unlocks Arachnid History

A new fossil found in France is almost a spider, but not quite.

The arachnid, locked in iron carbonate for 305 million years, reveals the stepwise evolution of arachnids into spiders. Dubbed Idmonarachne brasieri after the Greek mythological figure Idmon, father of Arachne, a weaver turned into a spider by a jealous goddess, the “almost spider” lacks only the spinnerets that spiders use to turn silk into webs.

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