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Phylum Mollusca > Class Gastropoda > Family Trochidae
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 Operculum thin, flexible usually withdrawn deep into the coils of the shell.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.

Tanah Merah, Sep 13

Tanah Merah, Sep 13

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
On wildsingapore flickr

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.

Sentosa Serapong, Apr 11


Pulau Tekukor, Nov 20
Photo shared by Marcus Ng on facebook.

Terumbu Raya, Sep 19
Photo shared by Kelvin Yong 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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