molluscs text index | photo index
Phylum Mollusca > Class Bivalvia
Photo index of bivalves on Singapore shores
small clams <8cm


Nest mussel
Arcuatula senhousia

Little black mussel
Xenostrobus sp.

Barbatia ark clam
Barbatia sp.

Scintilla clam
Family Galeommatidae
 
1-2cm. Shell thin, fragile, smooth. Countless clams create communal 'nests' out of byssal threads. Sometimes carpeting large areas on the shore, as well as on hard surfaces. Sometimes seen on our Northern shores. 1-2cm. Shell thin, fragile, smooth. Many clustered together on rocks, forming thin nests. Sometimes seen on our Northern shores. About 2.5cm. Shell oval with fine ribs and covered in a layer of fine brown hairs. Under stones. Sometimes seen on some of our shores. 1-2cm. Shell oval, thin and white. Mantle with little fingers may cover shell, forming a foot. Under stones. Sometimes seen on some of our shore.  


Coral scallop
Pedum spondyloideum

Singapore scallop
Volachlamys singaporina
 

Common file clam
Lima vulgaris

Swimming file clam
Limaria sp.
1-1.5cm. Shell flat, circular. Embedded in hard corals, especially those with branching forms. Sometimes seen on some of our Southern shores. 3-6cm. Shell flat, circular. Among seagrasses. Common on our Northern shores.   4- 6cm. Shell thick with clear ridges. Long fleshy tentacles that can be fully retracted. Under stones near reefs. Sometimes seen on our Southern shores. 4- 6cm. Shell thin with faint ridges. Long fleshy tentacles that cannot be fully retracted. Under stones near reefs. Sometimes seen on our Southern shores.


'See-ham'
Anadara granosa

Ribbed venus clam
Gafrarium
sp.

Large cockle
awaiting identification

Strawberry cockle
Fragum unedo
 
3-4cm. Shell white, clearly ribbed with small, rounded beads on the ribs. Animal bright red. On silty sand. Sometimes in large numbers on some of our Northern shores. 3-4cm. Shell has a straight portion, has thick 'ribs' of large squarish beads. Plain without markings. Sandy lagoons near seagrasses. Sometimes seen on some of our Southern shores. 5-6cm long. Shell oval to rectangular and hemispherical (not flat). With strong ribs sometimes with beads along the ribs. Coral rubble near reefs. Sometimes seen on our some of our shores. 4-6cm. Shell squarish. With strong ribs and red beads. Sandy area. Uncommon.  


Bean-shaped venus clam
awaiting identification

Forked venus clam
Gafrarium divaricatum

Script venus clam
Circe scripta

White venus clam
awaiting identification

Big brown mactra clam
Mactra grandis
About 4cm. Shell is smooth, oval and bean-shaped. Some with pattern of fine dark V-shapes. Sandy areas near seagrasses. Sometimes seen on Changi. About 4-6cm. Shell thick with fine ribs and usually a pattern of fine lines. Coral rubble and under stones. Common on some of our Northern shores. About 4-6cm. Animal flat, shell thick with fine ribs and usually a pattern of V's. Common on sandy shores near reefs and seagrasses on our Southern shores. About 4cm. Shell quite smooth, with very fine ridges. Usually plain mostly white with dark irregular blotches. Loose on coral rubble. Sometimes seen on some of our shores. About 6cm. Shell is smooth and unmarked, in shades of plain brown. Seagrass meadows. Sometimes seen on our Northern shores.


Surf clams
Donax sp.

Tellin clam
Family Tellinidae
 

Horse mussel
Modiolus sp.

Green mussel
Perna viridis
2-3cm. Shell triangular smooth with very fine grooves. Sandy shores. Sometimes seen on some of our shores. About 5cm. Shell thick with fine ribs, sometimes colourful. Seen once on Pulau Semakau.   3-4cm. Shell shiny brown, thin, fragile, smooth. Rather triangular. Among seagrasses on the ground. Sometimes seen on some of our shores. 5-8cm. Shell thin, smooth usually brownish edged in green. Attached to hard surfaces: jetty pilings, boulders. Common on our Northern shores, sometimes in huge numbers.
www.flickr.com
FREE photos of
bivalves.
Make your own badge here.
photo index of
molluscs on this site
Phylum Mollusca
all molluscs

Class Bivalvia
all clams

  small <8cm
large >8cm
odd-shaped
stuck to a rock
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