How long have water spiders been a live?

Water Spiders, specifically the species known as the diving bell spider (Argyroneta aquatica), have been around for millions of years. Fossil evidence suggests that the lineage of spiders dates back to at least 400 million years ago, but the specific adaptations of water spiders likely evolved more recently. They are unique for their ability to live underwater, using air bubbles to breathe. Overall, while their ancestors have existed for a long time, the modern water spider has been around for a shorter, yet significant, period in evolutionary history.