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Leaf
oyster
Isognomon ephippium, Isognomon spathulatus
Family
Pteriidae
updated
May 2020
Where
seen? These rather large flat clams are commonly seen in our
mangroves, scattered like white coins among mangrove tree roots. Sometimes
also seen growing in clusters on rocks or sea walls in sheltered areas near freshwater
inflows (brackish water). It is also called the Saddle tree oyster.
Isognomon spathulatus looks very much like Isognomon ephippium but they can be distinguished by features of their shells, these are outlined in Singapore Biodiversity Records 2020: 183-186.
Isognomon spathulatus is usually found on higher shores settling among mangrove vegetation, while Isognomon ephippium is usually found on lower shores and exposed on mudflats as well as estuarine sections of man-made canals.
Features: 6-10cm.
The two-part shell is flat, thin but strong, and usually semi-circular, with a flat base where the hinge is. Usually white or greyish. It sticks to tree roots with byssus threads,
thus giving the common name of tree oyster. Often found in clusters.
Human uses: In Thailand, they
are regularly collected for food and marketed.
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Lim Chu Kang, Aug 05
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Growing on a mangrove tree.
Sungei Buloh Wetland Reserve, Nov 03
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Growing along a muddy mangrove creek.
Changi Creek mangroves, May 17
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*Species are difficult
to positively identify without close examination.
On this website, they are grouped by external features for convenience of
display.
Leaf
oysters on Singapore shores |
Other sightings on Singapore shores |
Pasir Ris Park, Jan 20
Photo shared by Nurulhuda on facebook. |
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Links
References
- Chan Sow-Yan & Lau Wing Lup. 30 October 2020. New record of the mangrove leaf-oyster, Isognomon spathulatus, in Singapore. Singapore Biodiversity Records 2020: 183-186. The National University of Singapore.
- 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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