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Phylum Mollusca > Class Gastropoda > Family Naticidae
Sand collars of moon snails
Family Naticidae
updated Oct 2016
if you learn only 3 things about them ...
Although it feels plasticky and dead, the sand collar is full of living baby snails!
The size of the collar depends on the size of the mother moon snail.
When the baby snails hatch, the sand collar disintegrates.

Where seen? These frilly edged flat spirals are often seen on our sandy shores.

What is a sand collar?
The sand collar is the egg mass of a moon snail. A moon snail lays her eggs at night, combining these with mucus and sand in a gelatinous sheet which hardens. She lies at the center of the collar as she creates it, so the hole in centre of the collar gives an indication of the size of the mother snail. Some sand collars can be surprisingly large! They are usually the same colour and texture as the surrounding sand.

It's alive! Although the collar feels hard, plasticky and appears dead, each collar can contain thousands of living eggs. When the eggs hatch, the collar disintegrates.

Thus, an intact collar has living snails in it! Please don't damage the sand collars.

Pulau Sekudu, Jul 03

Chek Jawa, Nov 04

Lazarus Island, Jun 02

Kusu Island, Apr 05

Pulau Sekudu, Jul 08

Sand collars on Singapore shores

Photos of Sand collars for free download from wildsingapore flickr

Links References
  • Tan, K. S. & L. M. Chou, 2000. A Guide to the Common Seashells of Singapore. Singapore Science Centre. 160 pp.
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