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Phylum Mollusca > Class Bivalvia
True cockles
Family Cardiidae
updated May 2020
Where seen? These large cockles are sometimes seen on some of our shores. These animals usually burrow shallowly in sandy to muddy bottoms.

What are true cockles? True cockles belong to Family Cardiidae. There about 200 species of true cockles. These include the magnificent Giant clams in subfamily Tridacninae.

Features: 5-7cm. The two-part shell is sturdy and usually ridged. The hinge has two strong teeth in each valve. They have a short fringed siphon and
can use their long, strong, sickle-shaped foot to jump and escape predators.

Human uses: They are collected for shell craft and sometimes eaten by coastal dwellers.

Some True cockles on Singapore shores

Heart cockle

Fluted giant clam

Family Cardiidae recorded for Singapore
from Tan Siong Kiat and Henrietta P. M. Woo, 2010 Preliminary Checklist of The Molluscs of Singapore.
^from WORMS

  True cockles seen awaiting identification
Species are difficult to positively identify without close examination.
On this website, they are grouped by external features for convenience of display.
  Large cockles

  Family Cardiidae
  Acrosterigma angulatum
Acrosterigma discus
Acrosterigma elongata
Acrosterigma flava flava
Acrosterigma flava subrugosum=^Vasticardium flavum subrugosum
Acrosterigma impolitum
Acrosterigma luteomarginata
Acrosterigma maculosum
Acrosterigma transcendens
Acrosterigma vertebrata

Corculum cardissa
(Heart cockle)

Fragum hemicardium
Fragum retusum
Fragum unedo
(Strawberry cockle)

Fulvia aperta
Fulvia australis

Laevicardium biradiatum

Maoricardium setosum

Vepricardium asiaticum
Vepricardium coronatum
Vepricardium multispinosum
Vepricardium sinense

  ^Subfamily Tridacninae (Giant clams) including species recorded for 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.
  • 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.
  • Wee Y.C. and Peter K. L. Ng. 1994. A First Look at Biodiversity in Singapore. National Council on the Environment. 163pp.
  • Ng, P. K. L. & Y. C. Wee, 1994. The Singapore Red Data Book: Threatened Plants and Animals of Singapore. The Nature Society (Singapore), Singapore. 343 pp.
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