seen? These little clams are often seen among hard corals
on many of our Southern shores. The clam is embedded in living coral, excavating the hard coral to create a cavity for itself and attaching to the coral by byssus threads. The clam is usually completely surrounded by living tissue.
Features: Diameter 1-1.5cm. A
circular two-part shell. In some the shell is covered with encrusting
fluff, in others, some patterns may be seen. They are often seen in
hard corals with branching or leafy forms such as Acropora
corals (Acropora sp.), Crinkled
sandpaper coral (Psammocora sp.) and Branching
pore coral (Porites sp.).
Coral-clam cooperation: The coral provides the clam a safe place with support and protection. The clam may improve water circulation for the coral which helps the coral feed. A study
showed that the clam helped reduce the impact of predatory Crown-of-Thorns sea stars (Acanthaster planci) repeatedly spitting out jets of water. On the
other hand, the clam may weaken the coral as it excavates a cavity within the coral structure.
This page includes all the little clams found in hard corals, for
convenience of display. It is possible that they are different species
and may even not be scallops but belong to other families.
Pulau Hantu, Apr 07
Beting Bemban Besar, Apr 10
Sisters Island, Feb 10
Tanah Merah, Jun 11
*Species are difficult
to positively identify without close examination.
On this website, they are grouped by external features for convenience of
scallops on Singapore shores
Terumbu Hantu, Jun 16
Photo shared by Marcus Ng on flickr.
Terumbu Bemban, Jul 11
Photo shared by Loh Kok Sheng on his
Terumbu Pempang Tengah, Apr 13
Photo shared by Loh Kok Sheng on flickr.
Pulau Salu, Jun 10
Pulau Salu, Jun 10
Terumbu Berkas, Jan 10
- Tan Siong
Kiat and Henrietta P. M. Woo, 2010 Preliminary
Checklist of The Molluscs of Singapore (pdf), Raffles
Museum of Biodiversity Research, National University of Singapore.
- Patrick Scaps and Vianney Denis. 31 Aug 2007. Association between the scallop, Pedum spondyloideum, (Bivalvia: Pteriomorphia: Pectinidae) and scleractinian corals from the Wakatobi Marine National Park (Southeastern Sulawesi, Indonesia). Raffles Bulletin of Zoology 55(2):Pp 371-380 .
Neville. 2003. 2002
Sea Shells: Catalogue of Indo-Pacific Mollusca
Neville Coleman's Underwater Geographic Pty Ltd, Australia.144pp.
- Humann, Paul
and Ned Deloach. 2010. Reef
Creature Identification: Tropical Pacific New World Publications.
Terrence M., David W. Behrens and Gary C. Williams. 1996. Coral
Reef Animals of the Indo-Pacific: Animal life from Africa to Hawaii
exclusive of the vertebrates
Sea Challengers. 314pp.