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Phylum Mollusca > Class Gastropoda > sea slugs > Order Nudibranchia
Yellow-foot nudibranch
Thordisa villosa
Family Discodorididae
updated May 2020
Where seen? This rather boring but large nudibranch is sometimes seen on our Northern shores among coral rubble and rocky shores. Sometimes covered in a thin layer of silt. It appears to be seasonally common.

Features: 4-8cm long. The upperside of the broad hard body looks like coral rubble in colour and texture. Body yellow with a characteristic pattern of dark brown patches around the mantle edge. It is covered with bumps and some of the larger tapering finger-like structures (papillae) may be filled with fluid. The underside and small foot is yellow with brown or black spots. The body doesn't fall apart when handled. Tiny rhinophores and small feathery gills.

What does it eat? It eats sponges.

Chek Jawa, May 05

Tapering papillae on the body.


Punggol, Jun 12

Small feathery gills.

Larger bumps are filled with fluid.


Yellow-foot nudibranchs on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores

Changi Creek, May 21
Photo shared by Marcus Ng on facebook.

Changi Loyang, May 21

Photo shared by Jianline Liu on facebook.

Beting Bronok, Jul 22
Photo shared by Tammy Lim 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.
  • Humann, Paul and Ned Deloach. 2010. Reef Creature Identification: Tropical Pacific New World Publications. 497pp.
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