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Phylum Mollusca > Class Bivalvia
Photo index of bivalves on Singapore shores
clams with one side stuck to a rock or other hard surface


Mangrove jingle shell
Enigmonia aenigmatica

Under-a-stone jingle shell
awaiting identification
     
About 3cm, Shell thin elongated, white, golden to purplish. Found stuck to mangrove leaves, tree trunks, roots and other hard surfaces. Commonly seen in our mangroves. 2- 3cm, one side stuck to a rock, pearly, thin shell. Commonly seen on some of our shores.      


Spiked rock oyster
Saccostrea cuccullata

Plain rock oysters
awaiting identification

Zig-zag rock oysters
awaiting identification

File clam
Family Limidae

Thorny oysters
Spondylus
sp.
3-4cm. One side of shell stuck to hard surface. Shell thick with long hollow spikes. Attached to hard surfaces. Common on all our shores. 8-15cm. Plain shell, shell opening close to the surface, not regularly zig-zag. Common on rocks on the Northern shores. 3-8cm. Shell opening away from the surface, regularly zig-zag. Common rocks on the Southern shores. 4- 6cm. Shell is thick with clear ridges. Under stones near reefs. 8-10cm. Lower valve is cup-shaped and stuck to a hard surface. Upper valve flat covered with flat short spines. Among living reefs. Sometimes seen on some of our shores.

These animals are NOT bivalves

Limpets
Class Gastropoda
Phylum Mollusca

Limpets
Class Gastropoda
Phylum Mollusca

Slipper snails
Class Gastropoda
Phylum Mollusca

Barnacles
Subphylum Crustacea

Barnacles
Subphylum Crustacea

how to tell apart shelled animals found on rocks
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Class Bivalvia
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  small <8cm
large >8cm
odd-shaped
stuck to a rock
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