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Phylum Mollusca > Class Bivalvia > Family Veneridae
Ribbed venus clam
Gafrarium sp.*
Family Veneridae
updated May 2020
Where seen? This small sturdy clam with a ribbed pattern is sometimes seen on some of our Southern shores, usually alone on sandy areas in calm lagoons near seagrasses. Elsewhere, they are found on intertidal shores with coarse sand.

Features: 3-4cm in diameter. Shell circular with a straight portion on one side. The shell has thick 'ribs' made of up large squarish beads. Usually plain white without any patterns, although there may be irregular blotches which seem to be discoloration or algae growth.

Gafrarium tumidum is more 'swollen' or rounded with rougher ribs. Gafrarium pectinatum is 'flatter' with finer ribs. It's difficult to be sure without looking more closely at the animal.

Gafrarium pectinatum?
Pulau Hantu, Feb 07

Gafrarium tumidum?

Kusu Island, May 07

Gafrarium pectinatum?

Tanah Merah, Jul 10

Lazarus Island, Feb 11

Photo shared by Loh Kok Sheng on his flickr.

*Species are difficult to positively identify without close examination.
On this website, they are grouped by external features for convenience of display.

Ribbed venus clams on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores

East Coast (PCN), May 21
Photo shared by Vincent Choo on facebook.

Berlayar Creek, Oct 17
Photo shared by Abel Yeo on facebook.

Sentosa, Dec 09
Photo shared by Loh Kok Sheng on flickr.

St John's Island, Mar 11
Photo shared by Loh Kok Sheng on flickr.

Pulau Semakau South, Oct 18
Photo shared by Juria Toramae on facebook.

With grateful thanks to Andre Sartori from eBivalvia on EOL's Life Desk for identifying this clam.



  • 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.
  • Abbott, R. Tucker, 1991. Seashells of South East Asia. Graham Brash, Singapore. 145 pp.
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