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Spotted
top shell snail
Trochus maculatus
Family
Trochidae
updated
Sep 2020
Where
seen? This snail with a conical shell is commonly seen
on our Southern shores. On large boulders, rocky shores and artificial sea walls. Usually alone or groups of a few individuals. Elsewhere, they are common in coral reefs and rocky shores.
Features: 3-5cm, to 7cm. Shell thick heavy, conical with texture of spiraling thick
beads usually hidden under encrusting lifeforms. Underside yellow with
a pretty spiral pattern of brown spots. Operculum thin, flexible usually withdrawn deep into the coils of the
shell. Body
mottled, large foot, edge of the mantle sparsely fringed with long tentacles. A pair of long
tentacles at the head.
Sometimes confused with the Turban
snail (Family Turbinidae) which has a shell with more distinct
whorls and a thick, chalky operculum. While many Top snails have a
more conical shell and a thin operculum made of a horn-like material.
Here's more on how to tell apart turban
and top shell snails.
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Tanah Merah, Sep 13
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Tanah Merah, Sep 13
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Tanah Merah, Sep 13 |
Human
uses: In Vietnam and the Philippines, it is collected for
food and the shell trade |
Spotted
top shell snails on Singapore shores |
Other sightings on Singapore shores |
Tanah Merah,
May 09
Photo
shared by Loh Kok Sheng on his
blog. |
East Coast-Marina Bay, Nov 17
Photo shared by Loh Kok Sheng on facebook. |
East Coas Park, Aug 20
Photo shared by Vincent Choo on facebook. |
Berlayar Creek, Oct 15
Photo
shared by Loh Kok Sheng on facebook. |
Pulau Tekukor, Nov 20
Photo
shared by Marcus Ng on facebook. |
Terumbu Selegie, May 24
Photo shared by Richard Kuah on facebook. |
Pulau Semakau North, Jul 24
Photo shared by Tommy Tan on facebook. |
Terumbu Raya, Sep 19
Photo
shared by Kelvin Yong on facebook. |
Terumbu Bemban, Apr 24
Photo
shared by Che Cheng Neo on facebook. |
Terumbu Pempang Tengah, May 11
Photo
shared by Rene Ong on facebook. |
Terumbu Pempang Tengah, May 21
Photo
shared by Vincent Choo on facebook. |
Terumbu Pempang Laut, Jul 20
Photo
shared by Vincent Choo on facebook. |
Terumbu Berkas, Jan 10 |
Pulau Salu, Aug 10 |
Pulau Salu, Apr 21
Photo
shared by Vincent Choo on facebook. |
Links
References
- 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.
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