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A giant spider fossil discovered in Australia reveals the existence of ancient rainforests, offering key insights into ecosystem evolution before the continent underwent widespread and severe environmental aridification. DOI: 10.1093/zoolinnean/zlad100.

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Its body measured about 23 millimeters long (under an inch), making it roughly five times larger than its modern-day relatives. (Lol despite online posts, it was not the size of a dinner plate or a human)

Spiders have never had the molecular size of giant millipedes, etc., over the past 500 million years. This is due to their physiological restrictions; such as their lung system, a giant exoskeleton would crush spider tissue, its hydraulic leg system would fail & circulatory system collapse.