seen? This snail is commonly encountered
in large numbers on many of our shores. In shallow sandy and slightly
muddy areas which are sheltered from strong waves and currents, including
of man-made lagoons, usually near
the mid-water mark.
It is said that they can reach densities of
hundreds of snails per square metre. It
was previously placed in the Family Potamididae.
Features: 2-3cm. Shell
conical with pattern of white spiralling lines with finer lines and
large bumps. Shell opening oval, large, flared with upturned
spout at the tip.
Operculum is circular and made of a horn-like material with several
circular whorls that are usually quite visible. The animal has fine
bars on its mottled body, also on its proboscis and tentacles. Eyes
at the base of the tentacles.
Sometimes, they are seen in 'bands' of many individuals. Small ones
have been seen floating on the water surface with the broad foot.
Sometimes mistaken for Creeper
snails (Family Cerithiidae). More
on how to tell these snails apart.
What does it eat? It eats detritus and grazes on the
microscopic algae that grow on the bottom.
Sisters Islands, Feb 06
Upturned siphonal canal near the opening
Sometimes forming bands of many individuals.
Tanah Merah, Dec 09
Circular operculum made of horn-like material.
Seen floating on the water surface.
Tanah Merah, Jun 09
Tanah Merah, Sep 13
Mottled body with fine bars.
Tanah Merah, Sep 13
snails on Singapore shores
Pulau Sudong, Dec 09
Batillariidae recorded for Singapore
Tan Siong Kiat and Henrietta P. M. Woo, 2010 Preliminary Checklist
of The Molluscs of Singapore.
zonalis (Bazillion snails)
- 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.
- Tan, K. S.
& L. M. Chou, 2000. A
Guide to the Common Seashells of Singapore. Singapore
Science Centre. 160 pp.
- Abbott, R.
Tucker, 1991. Seashells
of South East Asia.
Graham Brash, Singapore. 145 pp.