Who knew that mole crab appendages could be so fascinating? Not only are these uropods really cool looking with (note the iridescence and the fine feather-like setae), but I was reading that after Emerita analoga use their uropods to swim down to the surface of the sand that they continue to beat their uropods while burrowing in a synchronous motion of 3-8 Hz, which is 3-8 times per second!

E. analoga from Ocean Beach (magnification 4.0 X 10)

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