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Phylum Mollusca > Class Gastropoda > Family Nassariidae
Mud whelk
Nassarius jacksonianus
Family Nassariidae
updated Aug 2020

Where seen? A tiny whelk that can be seen busily foraging, especially at night, on muddy and silty sandy areas near seagrasses on our Northern shores. Many sometimes seen gathered together grazing on seaweeds, or on a recently dead sea creature.

Features: 1.5-2cm. Small lumpy-looking whelk. Shell thick with bumpy ridges on the spire, the front of the shell often with a broad brown band. Body pale with very long siphon and short tentacles. Operculum thin, pale.

Tuas, Sep 08

Large numbers cluster on a dead fish.
Changi, Jan 07
Whelk food: Whelks are active scavengers and often seen busily foraging in pools at the change of the tides. A choice morsel such as a dead crab or fish is a magnet for these snails which hurry as fast as they can to the feast.

Mud whelks on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores

Pulau Ubin OBS, Jan 16
Photo shared by Marcus Ng on facebook.



  • Tan Siong Kiat and Henrietta P. M. Woo, 2010 Preliminary Checklist of The Molluscs of Singapore (pdf), Lee Kong Chian Natural History Museum, National University of Singapore.
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