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
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
Pulau Hantu, Mar 10
sundial snails on Singapore shores
Changi, May 17
Photo shared by Marcus Ng on facebook.
Kusu Island, Aug 17
Photo shared by Richard Kuah on facebook.
Cyrene Reef, Nov 17
Photo shared by Loh Kok Sheng on facebook.
- Tan Siong Kiat & Chan Sow-Yan. 31 Aug 2017. Recent sightings of two species of sundial shells at eastern Singapore. Singapore Biodiversity Records 2017: 116-118.
- 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.
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.
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.