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Phylum Mollusca > Class Gastropoda > Family Cassidae
Japanese bonnet snail
Phalium/Semicassis bisulcata

Family Cassidae
updated Jul 2020

Where seen? This beautiful snail is sometimes seen on Cyrene and Changi, on sandy areas.

Features: 5-7cm long. Shell typical helmet shape with a large body whorl and tiny spire, thus resembling a bonnet. The shell has spiral ribs, 25-40 on the body whorl. Outer lip reflected, toothed on the inner edge. White, cream, pink or blue-grey. Sometimes unmarked, sometimes with 4 or 5 spiral bands of brown spots. It has a white body and the sole of the foot is dark. The operculum is fan-shaped and pale yellow.

What does it eat? According to Gosliner, it presumably feeds on heart urchins including the Tiny maretia heart urchin.

Cyrene Reef, Jun 12

Changi, May 11


Japanese bonnet snails on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores

Changi, Feb 09
Photo shared by Loh Kok Sheng on his blog.

Changi, Jan 18
Photo shared by Abel Yeo on facebook.

Cyrene Reef, Mar 09
Photo shared by Loh Kok Sheng on his blog.

Cyrene Reef, Mar 09
Photo shared by Chim Chee Kong on his flickr.

Cyrene Reef, Jun 11

Photo shared by Loh Kok Sheng on flickr.

shared by Neo Mei Lin on her blog

Grateful thanks to Chim Chee Kong for identifying this snail on his flickr.



  • 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.
  • Gosliner, Terrence M., David W. Behrens and Gary C. Williams. 1996. Coral Reef Animals of the Indo-Pacific: Animal life from Africa to Hawaii exclusive of the vertebrates Sea Challengers. 314pp.
  • Abbott, R. Tucker, 1991. Seashells of South East Asia. Graham Brash, Singapore. 145 pp.
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