The buff-clawed Seagrass Sentinal Crab, prefers the estuarine shores with a cover of zostera seagrass. This crab ranges from north-western Australia across northern Australia and then south throughout eastern Australia.

When threatened, or in display, both chelae are raised. The males are territorial and will fight off competitors with a ritualised display.

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Mudflat Sentinal Crab, Macrophthalmus crassipes

The blue-clawed Mudflat Sentinal Crab, Macrophthalmus setosus, is found in large numbers out near low tide level on very muddy estarine shores. It is found from eastern Queensland to Sydney.

It sometimes lies partly buried in mud in shallow pools, with only its long eyestalks appearing above the water surface.

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References:

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