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Phylum Mollusca > Class Gastropoda > sea slugs > Order Sacoglossa > Elysia species
Woolly leaf slugs
Elysia sp.
Family Plakobranchidae
updated Jun 2020
Where seen? These tiny slugs appear woolly or fuzzy. They are sometimes seen on many of our shores, usually on green seaweeds. Sometimes, they occur in large numbers.

Features: 1.5-2cm. Tiny slug with a pair of 'wings' (called parapodia) often held in ruffles. The body texture of tiny bumps gives it a fuzzy or woolly appearance. There is a pair of 'rolled up' tentacles: look like rolls of tissue with a hollow centre, not solid tentacles like other slugs. Generally pinkish with black spots. Some have a black border around the parapodia. Some are very fast moving.

Larger one seen among seagrasses.
Cyrene Reef, Dec 16

About 1cm long. Seen on Coin green seaweed
Labrador, Jul 05
It is difficult to tell apart the species in the field, but in general, Elysia tomentosa is generally dark green with a thin dark line along inner and outer margins of the parapodia. Between the two lines the parapodial margins
were cream-coloured. Many black dots on the body, head and rhinophores. No dots on foot sole.

Elysia cf. verrucosa is greyish green with many scattered small black spots. Also, many tiny orange or red dots.

What do they eat? They have been seen on Bee hoon green seaweed (Chaetomorpha sp.), and are sometimes abundant on Hairy green seaweed (Bryopsis sp.).

Chek Jawa, Jul 05

Green underside.
Chek Jawa, Jul 05

Chek Jawa, Jul 05

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

Woolly leaf slugs on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores

Pasir Ris Park, Jul 17
Shared by Abel Yeo on facebook.

Changi, Oct 08
Shared by Toh Chay Hoon on flickr.


Changi Creek, May 21
Shared by Toh Chay Hoon on facebook.

Changi Lost Coast, Jun 22
Shared by Loh Kok Sheng on facebook.

Pulau Sekudu, Jul 20
Shared by Toh Chay Hoon on facebook.

Pulau Sekudu, Oct 11
Photo shared by Loh Kok Sheng on his blog.

St. John's Island, May 10
Shared by Toh Chay Hoon on her blog.

Pulau Tekukor, May 10
Shared by Geraldine Lee on her blog.

Pulau Jong, Nov 08
Shared by Toh Chay Hoon on her flickr.

Terumbu Selegie, Jan 17

Photo shared by Toh Chay Hoon on facebook.

Cyrene Reef, Oct 08
Shared by Toh Chay Hoon on her flickr.

Cyrene Reef, Aug 17
Shared by Marcus Ng on facebook.


  • 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.
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