Keyhole Sand Dollar (Echinodiscus bisperforatus truncatus)
Tanah Merah, 23rd August 2009
- Wild Fact Sheets
- The Tide Chaser: Sea Urchins (Phylum Echinodermata: Class Echinoidea) of Singapore
- Singapore Red Data Book 2008
- The Echinoid Directory
- World Echinoidea Database
- Sublittoral sand dollar (Echinodiscus bisperforatus) communities in two bays on the South African south coast
- Echinoderm fauna of Thailand: History and inventory reviews
- Echinoderm fauna of the South China Sea: an inventory and analysis of distribution patterns