London - With their purple shells and orange pincers, it’s a wonder this newly-discovered species of crab, known as the Insulamon palawanense, has remained hidden from scientists for so long.
Perhaps it’s because they measure just 33mm by 25mm — about the size of a 50p — and spend most of their time burrowed under boulders.
The crabs were discovered in the remote freshwater shallows of the Palawan islands of the Philippines. Marine biologists believe the DayGlo shells play a role in attracting a mate. Dominant males grow more reddish in colour, while the females and immature males are violet. - Daily Mail