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Phylum Mollusca > Class Gastropoda > Family Olividae
Weasel olive snail
Oliva mustelina*
Family Olividae
updated Sep 2020

Where seen? This small bullet-shaped snail is sometimes seen on Changi and our Northern shores. A burrowing snail, more often seen above the ground at night or with the incoming tide. To find it, look out for the typical trail it leaves on the sand surface as it burrows beneath.

Features: 2-3.5cm. Shell thick heavy glossy, cylindrical bullet-shaped with conical spire. Shell pattern beige with closely set fine dark brown zig-zag lines. Shell opening violet. Body large beige with brownish spots all over. A long siphon sticks out of the notch in the shell.

Changi, Jun 06

Shell opening violet.
East Coast Park, Aug 09

Short conical spire.

Typical trail of a burrowing olive snail in wet sand.
Chek Jawa, Jul 08

Weasel olive snail (Oliva mustelina)

*Species are difficult to positively identify without close examination.
On this website, they are grouped by external features for convenience of display.

Weasel olive snails on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores

  • Oliva mustelina on SeaLife Base: Technical fact sheet and photo.
  • Family Olividae in the Gastropods section by J.M. Poutiers in the FAO Species Identification Guide for Fishery Purposes: The Living Marine Resources of the Western Central Pacific Volume 1: Seaweeds, corals, bivalves and gastropods on the Food and Agriculture Organization of the United Nations (FAO) website.


  • 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.
  • Abbott, R. Tucker, 1991. Seashells of South East Asia. Graham Brash, Singapore. 145 pp.
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