bivalves text index | photo index
Phylum Mollusca > Class Bivalvia > Family Cardiidae
Heart cockle
Corculum cardissa
Family Cardiidae
updated Oct 2016
Where seen? This intriguing clam is sometimes seen on our Southern shores, near reefs. Sometimes on the sand, on rubble or among seagrasses. Elsewhere, often found on sandy bottoms often associated with reefs, sometimes in dense colonies.

Features: 4-6cm. The two-part shell is thin and heart-shaped with the opening of the valves down the centre of the 'heart'. One half of the valve is flat while the other is convex. The colour may be dull yellowish to sometimes with bright flecks of red and yellow. The clam attaches itself to a hard surface with small byssus threads.

Human uses: It is collected for shell craft.

Pulau Semakau, Feb 09

Side view.

Concave side.

Convex side.

Convex side.
Pulau Semakau, Feb 09

Flat side.

Side view.

Heart cockles on Singapore shores

Photos of Heart cockles for free download from wildsingapore flickr

Distribution in Singapore on this wildsingapore flickr map

Pulau Semakau, Feb 08

Photo shared by Loh Kok Sheng on his blog.

Pulau Senang, Jun 10

Photo shared by Loh Kok Sheng on his flickr.

Terumbu Pempang Laut, May 15
Photo shared by Heng Pei Yan on facebook.



  • 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.
  • Chou, L. M., 1998. A Guide to the Coral Reef Life of Singapore. Singapore Science Centre. 128 pages.
  • Abbott, R. Tucker, 1991. Seashells of South East Asia. Graham Brash, Singapore. 145 pp.
  • Gosliner, 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.
FREE photos of True cockles. Make your own badge here.
links | references | about | email Ria
Spot errors? Have a question? Want to share your sightings? email Ria I'll be glad to hear from you!
wildfactsheets website©ria tan 2008