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Phylum Mollusca > Class Gastropoda > Family Calyptraeidae
Flat slipper snail
Siphopatella walshi
Family Calyptraeidae
updated Jul 2020
Where seen? This snail is commonly encountered inside a shell occupied by a hermit crab. It is also sometimes found on the underside of horseshoe crabs. It was previously known as Crepidula walshi.

Features: 1-3.5cm. Shell thin, conical or flat, usually white. It is usually found in pairs. The larger one is usually the female and the smaller one male. When the smaller one grows big enough, it will change into a female!

Sometimes confused with limpets which are also gastropods but which can move about. Here's more on how to tell apart limpets, slipper snails and similar animals.

Chek Jawa, Mar 05

The smaller shell is usually the male.

Changi, Apr 05

Sisters Island, Jan 11

Tanah Merah, Sep 13

Changi, Jul 04

Flat slipper snails on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores

Terumbu Semakau, Apr 21
Photo shared by Vincent Choo on facebook.


  • 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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