March of the spider crabs
May 07, 2020
4 minutes
STORY AND PHOTOGRAPHY BY JUSTIN GILLIGAN
A SINGLE GIANT SPIDER CRAB can be hard to see. It barely exceeds 15cm across, despite its common name, and its triangular upper shell is covered in spines, hairs and knobs that make it blend into an ocean floor background. It will even make itself more inconspicuous by placing living sponges, hydroids and algae onto its shell from the surrounding temperate reef environment where it lives. But when this species comes together en masse, in aggregations that can exceed 50,000 individuals, it’s difficult to miss.
Spider crabs converge like this at several locations around Australia – including in South Australia and Tasmania –
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