Guardian Nature School Team Contact Blog Project Noah Facebook Project Noah Twitter

A global community of nature enthusiasts
photographing and learning about wildlife

Join Project Noah!
nature school apple icon

Project Noah Nature School visit nature school

Fluted Giant Clam

Tridacna squamosa


The fluted giant clam, also known as Scaled Clam, can be identified by the large, leaf-like fluted "scales" on its shell -- these are often used as shelter by crab, smaller clam and other invertebrates. The mantle is normally brown, generally mottled with vivid green and blue spots or wavy lines. T. squamosa is a filter-feeder, just like other members of the Tridacnidae family. However, it derives a larger portion of its nutritional intake from energy produced by dinoflagellate algae, which reside on the clam's mantle tissues. By day, the clam spreads out its mantle to maximize the algae's photosynthetic capacity. Sessile in adulthood, this giant clam grows to a size of 40cm across.


T. squamosa, as with other giant clam species, exist in shallow waters, from 15 to 20m. Found on sandy bottoms of coral reefs, typically wedged amidst Acropora coral heads. Distribution: tropical Indo-Pacific.


Spotted this juvenile fluted giant clam, measuring about 15cm across, during a day dive somewhere near Talikud Island. The map here only shows the general area of this spotting; I don't want poachers to be able to make use of my data to conduct their illegal activities.

Species ID Suggestions

Sign in to suggest organism ID


Maria dB
Maria dB 8 years ago

cool series, Blogie!

Blogie 8 years ago

Thanks, Alice! Very nicely put. :)

alicelongmartin 8 years ago

I really like the third picture, like opening a treasure chest!

Spotted by

Davao Del Norte, Philippines

Spotted on Aug 9, 2012
Submitted on Aug 10, 2012

Noah Guardians
Noah Sponsors

Join the Project Noah Team Join Project Noah Team