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Phylum Mollusca > Class Bivalvia > Family Pteriidae > Genus Isognomon
Leaf oyster
Isognomon ephippium
Family Pteriidae
updated Oct 2016
Where seen? This rather large flat clam is commonly seen in our mangroves, scattered like white coins among mangrove tree roots. Sometimes also seen growing on rocks or sea walls in sheltered areas near freshwater inflows (brackish water). It is also called the Saddle tree oyster.

Features: 6-10cm. The two-part shell is thin, flat and usually circular in shape.
Usually white or greyish. It sticks to tree roots with byssus threads, thus giving the common name of tree oyster. Often found in large groups.

Human uses: In Thailand, they are regularly collected for food and marketed.

Sungei Buloh Wetland Reserve, May 02

Sungei Buloh Wetland Reserve, Mar 05

Sungei Buloh Wetland Reserve, Nov 03

Lim Chu Kang, Aug 05

Leaf oysters on Singapore shores

Photos of Leaf oysters for free download from wildsingapore flickr

Distribution in Singapore on this wildsingapore flickr map



  • 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.
  • Tan, K. S. & L. M. Chou, 2000. A Guide to the Common Seashells of Singapore. Singapore Science Centre. 160 pp.
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