The Tuxedo Crab is a beautiful little crab that can be found in oyster clumps in thick, sloppy mud very low on esuarine mud shores. The four white patches on the face, white eyestalks, grey and blue base colour and orange tipped chelae are distinctive.

With it's distinctive white-striped face, this is a pretty little crab of the lower mudflats.

It ranges from the Northern Territory (Davie 2004), north-east Queensland south to Sydney, New South Wales.

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Blue-swimmer Crab, Portunus pelagicus

The fierce flesh-eating Blue Swimmer Crab, Portunus pelagicus, follows the tide as it comes in. It is trying to capture any foolish creature that hasn't hidden itself.

I have seen Blue Swimmer Crabs hunt down foolish Seagrass Semaphore Crabs that haven't sought shelter before the tide came in.

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References:

Davey, K. 1998. A Photographic Guide to Seashore Life of Australia.
New Holland Publishers, Sydney.