Size: about 0.5-0.8 mm
Some males, like those of the White semaphore crab (I. delsmani) even change their body colour to a stunning white which does stand out on a drab mangrove background and then jumping frantically waving their claws. When resting, they turn a dull grey to brown!
Another common species is Tweedies semaphore crab (I. obliqua).
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From "A Guide to Mangroves of Singapore", Peter K. L. Ng and N. Sivasothi (editors)
Volume 1: The Ecosystem and Plant Diversity and Volume 2: Animal Diversity
Authors: Kelvin K. P. Lim, Dennis H. Murphy, T. Morgany, N. Sivasothi, Peter K. L. Ng,
B. C. Soong, Hugh T. W. Tan, K. S. Tan & T. K. Tan
BP Guide to Nature Series published by the Singapore Science Centre, sponsored by British Petroleum
© 2001 Raffles Museum of Biodiversity Research, The National University of Singapore & The Singapore Science Centre