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Phylum Mollusca > Class Bivalvia > Family Mactridae
Big brown mactra clam
Mactra grandis
Family Mactridae
updated Oct 2016
Where seen? This large brown clam is often seen on our Northern shores in silty and sandy places near seagrass areas. Usually alone. According to Wong, it is perhaps the most commonly encountered member of the Family Mactridae in Singapore. It was previously known as Mactra mera.

Features: 6-7cm. The two-part shell is thick, smooth and usually unmarked, in shades of plain brown to purplish brown. It has a short siphon and usually lies buried just beneath the surface with its siphon sticking out. Sometimes, though, an unburied individual might be encountered on the shore.

Changi, Jan 07

Changi, Jan 07

Chek Jawa, Mar 04

Pulau Sekudu, May 12

Changi, Aug 12


A clam escaping from a Noble volute using its foot.
Changi, May 12

Volute heading in the 'wrong' direction.
Changi, May 12

Big brown mactra clams on Singapore shores

Photos of Big brown mactra clams for free download from wildsingapore flickr

Distribution in Singapore on this wildsingapore flickr map


Berlayar Creek, Apr 16
Photo shared by Loh Kok Sheng on flickr.

St. John's Island, Apr 16
Photo shared by Loh Kok Sheng on his blog.


Sisters Island, Aug 15
Photo shared by Heng Pei Yan on facebook.

Sisters Island, Aug 15
Photo shared by Heng Pei Yan on facebook.

Links

References


www.flickr.com
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