collars of moon snails
learn only 3 things about them ...
it feels plasticky and dead, the sand collar is full of
living baby snails!
size of the collar depends on the size of the mother moon
When the baby snails hatch, the sand collar disintegrates.
seen? These frilly edged flat spirals are sometimes numerous on sandy shores, as well as seagrass areas.
What is a sand collar? The sand collar is the egg mass
of a moon snail. A moon snail lays her eggs at night. The
eggs are laid singly in capsules which are embedded in a matrix of
sand grains - a combination of mucus and sand which forms a gelatinous
sheet that hardens. She lies at the center of the collar as she creates
it, so the hole in centre of the collar may give an indication of the
size of the mother snail.
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.
Unique collars: Can we tell which kind of moon snail laid the sand collar? One study suggests that each species of moon snail lays a consistently distinctive sand collar. With differences in the overall shape and size, number of coils, capsule size and packing density in different species.
Pulau Sekudu, Jul 03
Chek Jawa, Nov 04
collars on Singapore shores
- Dun-Ru Kang et al. Egg-collar morphology and identity of nine species of Naticidae (Gastropoda) in Taiwan, with an assessment of their phylogenetic relationships. November 2018. Journal of Molluscan Studies 84:354-378 DOI: 10.1093/mollus/eyy041
- Tan, K. S.
& L. M. Chou, 2000. A
Guide to the Common Seashells of Singapore. Singapore
Science Centre. 160 pp.