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Phylum Mollusca > Class Gastropoda > Family Naticidae
Naked moon snail
Sinum sp.
Family Naticidae
updated Aug 2020

Where seen? Resembling a large stiff white slug, this snail is sometimes seen in our seagrass meadows and sandy shores at night. When the shell is seen, it looks like a moon snail that refuses to withdraw into its shell. It is also called the Ear moon snail or Baby ear moon snail because of the shape of its delicate shell.

Features: The animal can be 10cm long. Shell small (about 2cm) thin, white and flat with a wide shell opening and is usually completely covered by the living animal. Body leathery and white, huge and unable to retract completely into the shell. The animal can produce a large amount of slime.

Chek Jawa, Apr 05

Chek Jawa, Mar 12

Chek Jawa, Dec 19
Naked moon snail (Sinum sp.)

Naked moon snails on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores

Changi, May 11

Photo shared by Loh Kok Sheng on his blog.

Changi, Jul 12

Photo shared by Loh Kok Sheng on flickr.

Changi, Apr 14

Photo shared by Loh Kok Sheng on flickr.

East Coast Park, Feb 16

Photo shared by Loh Kok Sheng on his blog.

East Coast Park, Aug 18
Photo shared by Loh Kok Sheng on facebook.

Tanah Merah Ferry Terminal, Jun 23
Photo shared by Loh Kok Sheng on facebook

Terumbu Semakau, May 13
Photo shared by Loh Kok Sheng on flickr.

Lazarus Island, Nov 22
Photo shared by Kelvin Yong on facebook.

Berlayar Creek, Apr 23
Photo shared by Richard Kuah on facebook.


  • 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.
  • Abbott, R. Tucker, 1991. Seashells of South East Asia. Graham Brash, Singapore. 145 pp.
  • Coleman, Neville. 2003. 2002 Sea Shells: Catalogue of Indo-Pacific Mollusca Neville Coleman's Underwater Geographic Pty Ltd, Australia.144pp.
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