Where seen? These beautiful snails are rarely seen on our
shores. They are found in tropical to warm-temperate regions near
Features: An unmistakable snail,
the shell coils usually forming a flat disc-shaped with a flat base.
This shape allows the snails to burrow through sand. The operculum
is made of a horn-like material. Head with a short snout and a pair
of long, tapering and very slender tentacles bearing eyes at their
outer bases.The end of the the foot has two pointed lobes. The body
is striped to match the shell.
What do they eat? They feed on
sea anemones, corals and zoanthids. The mouth region is lined with
a tough cuticle as a protection against stings of their prey.
Sundial babies: The snails are
simultaneous hermaphrodites. Eggs are numerous, laid in capsules and
embedded in a gelatinous mass anchored to the substrate, hatching
as planktonic larvae. Pelagic larval stages often long, hence the
snails have a very wide distribution.
Human uses: They are occasionally
collected by shrimp trawlers, consumed by fishermen and used as decorative
items in the shellcraft industry.
Status and threats: The Clear
sundial snail (Architectonica perspectiva) 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.
Architectonicidae recorded for Singapore
from Tan Siong
Kiat and Henrietta P. M. Woo, 2010 Preliminary Checklist of The
Molluscs of Singapore..
in red are those listed among the threatened
animals of Singapore from 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
+from our observation
Architectonicidae on The Gladys Archerd Shell Collection at
Washington State University Tri-Cities Natural History Museum
website: brief fact sheet with photos.
Architectonicidae in the Gastropods section by J.M. Poutiers in
the FAO Species Identification Guide for Fishery Purposes: The
Living Marine Resources of the Western Central Pacific Volume
1: Seaweeds, corals, bivalves and gastropods on the Food and
Agriculture Organization of the United Nations (FAO) website.
- 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.
- Wee Y.C.
and Peter K. L. Ng. 1994. A First Look at Biodiversity in Singapore.
National Council on the Environment. 163pp.
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.