Phylum Echinodermata > Class Echinodea > Order Clypeasteroida
Keyhole sand dollars on Singapore shores
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Changi, Jun 06

Upperside of living sand dollar.


Underside of living sand dollar.

Hidden in the sand
Changi, Jun 06

Tanah Merah, Jun 08
Photo shared by Loh Kok Sheng on his blog.

Test of dead keyhole sand dollar.
Tanah Merah, Feb 09

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