English Common Name

Marsh Clam, Broad Geloina

Scientific name

Polymesoda expansa

Taxonomy

Order: Veneroida, Family: Cyrenidae

Size

About 13 cm

Species Distribution

Okinawa Island, Yaeyama Islands, the Phillipines, and Andaman Islands

Okinawa Red List of Threatened Species: Critically Endangered

Japan Red List of Threatened Species: Vulnerable

This species lives in an intertidal zone of mangrove forests. Polymesoda expansa is the largest species of clams found in mangrove ecosystem. The number of specimens collected or observed is few, and more study is expected in the future to understand its genetic characteristics.

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Updated December 2018

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