learn only 3 things about them ...
| Some jingle clam species are found on mangrove leaves.
These may only feed at high spring tides.
species are globally endangered due to overcollection.
seen? Like slivers of mother-of-pearl, the lustrous shells
of dead jingle clams are often washed ashore. Intrigued beach-comers
might wonder what made these delicate treasures.The living animals
are commonly found under stones, while some species settle on mangrove
tree trunks and leaves.
What are jingle clams? Jingle clams belong to Family Anomiidae.
A handful of these delicate shells makes a jingling sound, which is
probably how their common name came about. The Window-pane
clam (Placuna sp.) was previously grouped under
Family Anomiidae. It is now under Family Placunidae.
Features: 3-6cm in
diameter. The animal has a two-part shell although those stuck to
rocks and hard surfaces may appear to only have one valve. The lustrous
shells are paper thin and translucent. It seems difficult to imagine
how something so delicate can protect an animal.
confused with limpets which are gastropods and can move about. Slipper
snails (Crepidula sp.) also appear similar. Here's more
on how to tell apart
limpets, slipper snails and similar animals.
What do they eat? Like other bivalves,
jingle clams are filter feeders. When submerged, a jingle clam opens
its valves a little. They then generate a current of water through
the shell and sieve out the food particles with enlarged gills. When
exposed at low tide, the valves are clamped tightly shut to prevent
Mangrove jingle clam on a mangrove leaf.
Lim Chu Kang,
Mangrove jingle clam on a mangrove tree trunk.
In this shell of a dead Under-a-stone jingle clam,
you can see the notch in the valve
that was stuck to the rock
Pulau Sekudu, Jun 06
|Status and threats: Like
other creatures of the intertidal zone, they are affected
by human activities such as reclamation and pollution. Trampling
by careless visitors can also affect local populations.
|Some Jingle clams on Singapore shores
Anomiidae recorded for Singapore
Tan Siong Kiat and Henrietta P. M. Woo, 2010 Preliminary Checklist
of The Molluscs of Singapore.
+from our observation
clams seen awaiting identification
are difficult to positively identify without close examination.
On this website, they are grouped
by external features for convenience of display.
Anomia sol=^Anomia achaeus
Enigmonia aenigmatica (Mangrove
jingle clam)=Enigma rosea
Pododesmus caelata=^Monia nobilis
- 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.
- 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.