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Phylum Mollusca > Class Gastropoda > Family Architectonicidae
Clear sundial snail
Architectonica perspectiva

Family Architectonicidae
updated Oct 2016

Where seen? The delightful living snail are sometimes encountered on our Southern shores on sandy areas near reefs. Elsewhere, it is considered moderately common and usually found subtidally on sandy and muddy bottoms, from depths of 10 to 120m, mostly between 10 and 65m.

Features: 5-7cm in diameter. An unmistakable snail, the shell coils form a flat disc-shape with a flat base. The shell has beautiful spirals in white, black and shades of brown. The body and fat tentacles are striped too, to match the shell. The operculum is made of a horn-like material.

What does it eat? It is said to eat burrowing sea anemones and sea pens. The mouth region is lined with a tough cuticle as a protection against stings of their prey.

Status and threats: The Clear sundial snail is listed as 'Endangered' in the Red List of threatened animals of Singapore. The original shores where they were found have been lost to reclamation.

Sisters Island, Jan 10

Laying egg mass.
St. John's Island, May 09

Photo shared by Loh Kok Sheng on his blog.

Pulau Hantu, Mar 10

Clear sundial snails on Singapore shores

Photos of Clear sundial snails for free download from wildsingapore flickr

Distribution in Singapore on this wildsingapore flickr map

Filmed at Pulau Hantu on 12 Apr 09

sundial snail @ Pulau Hantu 12Apr2009 from SgBeachBum on Vimeo.



  • 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.
  • Davison, G.W. H. and P. K. L. Ng and Ho Hua Chew, 2008. The Singapore Red Data Book: Threatened plants and animals of Singapore. Nature Society (Singapore). 285 pp.
  • Abbott, R. Tucker, 1991. Seashells of South East Asia. Graham Brash, Singapore. 145 pp.
  • 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.
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