May 10, 2009January 2, 2018 by mondaymorgue Uncategorized Astriclypeidae, Clypeasteroida, echinoderms, Echinodiscus bisperforatus, Echinodiscus bisperforatus truncatus, Echinodiscus truncatus, Echinoidea, Irregularia, keyhole sand dollar, marine, Monday Morgue, sand dollars, sea urchins, Singapore Strait, Tanah Merah Leave a comment Keyhole Sand Dollar (Echinodiscus truncatus) Tanah Merah, 8th February 2009 NParks Flora&FaunaWeb Wild Fact Sheets The Tide Chaser: Sea Urchins (Phylum Echinodermata: Class Echinoidea) of Singapore Singapore Red Data Book 2008 The Echinoid Directory Share this:TwitterFacebookLike Loading... Related