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Phylum Mollusca > Class Gastropoda > sea slugs > Order Sacoglossa > Elysia species
Halimeda slug
Elysia pusilla
Family Plakobranchidae
updated Oct 2016
Where seen? This tiny slug is sometimes seen on Big coin green seaweeds (Halimeda sp.). Several slugs may be seen on one clump of seaweed. It was previously known as Elysiella pusilla.

Features: A tiny well camouflaged slug (0.5-1.5cm long). Oval, flat almost featureless body, with tiny tentacles at the head. The body is transparent or exactly the same colour as the seaweed that it is found on. The seaweed concentrates defensive chemicals in its youngest parts. Studies show that the slugs not only prefer to feed on these parts of the seaweed, but also use the chemicals to protect themselves and their eggs.

Labrador, Mar 05

Labrador, Jun 05

Terumbu Semakau, May 17
Photo shared by Toh Chay Hoon on facebook.

Terumbu Semakau, May 17
Photo shared by Toh Chay Hoon on facebook.

Halimeda slugs on Singapore shores

Photos of Halimeda slugs for free download from wildsingapore flickr

Distribution in Singapore on this wildsingapore flickr map



  • K. R. Jensen. Sacoglossa (Mollusca: Gastropoda: Heterobranchia) from northern coasts of Singapore. 10 July 2015. The Comprehensive Marine Biodiversity Survey: Johor Straits International Workshop (2012) The Raffles Bulletin of Zoology 2015 Supplement No. 31, Pp. 226-249.
  • Kathe R. Jensen. 30 Dec 2009. Sacoglossa (Mollusca: Gastropoda: Opisthobranchia) from Singapore. The Raffles Bulletin of Zoology, Supplement 22: 207-223.
  • 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.
  • Debelius, Helmut, 2001. Nudibranchs and Sea Snails: Indo-Pacific Field Guide IKAN-Unterwasserachiv, Frankfurt. 321 pp.
  • Wells, Fred E. and Clayton W. Bryce. 2000. Slugs of Western Australia: A guide to the species from the Indian to West Pacific Oceans. Western Australian Museum. 184 pp.
  • Coleman, Neville. 2001. 1001 Nudibranchs: Catalogue of Indo-Pacific Sea Slugs. Neville Coleman’s Underwater Geographic Pty Ltd, Australia.144pp.
  • Humann, Paul and Ned Deloach. 2010. Reef Creature Identification: Tropical Pacific New World Publications. 497pp.
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