seen? This slug looks just like a bit of boring seaweed,
so it's often overlooked unless you know what to look for. It is sometimes
seen on our Northern shores moving among seaweeds at night. This slug
was previously called Phyllobranchus or Phyllobranchillus
Body with a lot of large leaf-like extensions (called cerata). So
it does appear like a tiny bush. The cerata contain fine branching
digestive glands. The cerata drop off easily when the animal is handled,
and tend to stick to the hand. New cerata grow back in a few days.
In addition, a distasteful milky secretion is produced by glands on
the edges of the cerata. It has an internal shell, a pair of tentacles
(called rhinophores) that are branched. The tentacles are sually hidden
by the cerata.
What does it eat? Like other sap-sucking
slugs, it eats seaweeds. It is believed that the colour of the animal
varies with the colour of the seaweed that it last ate. Thus, they
may be green, brown or red. They may be transparent if they haven't
eaten much. On Cyrene Reef, several individuals were seen nestled
in a large clump of Caulerpa
Out of water, the internal parts can be seen.
Changi, May 11
Chek Jawa, Aug 05
Pulau Sekudu, Aug 05
slugs on Singapore shores
|Other sightings on Singapore shores
Chek Jawa, Jul 18
Photo shared by Toh Chay Hoon on facebook.
East Coast Park, Jul 13
Photo shared by Loh Kok Sheng on flickr.
- 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.
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.
- Humann, Paul
and Ned Deloach. 2010. Reef
Creature Identification: Tropical Pacific New World Publications.
- Kuiter, Rudie
H and Helmut Debelius. 2009. World
Atlas of Marine Fauna. IKAN-Unterwasserachiv. 723pp.
Neville. 2001. 1001
Nudibranchs: Catalogue of Indo-Pacific Sea Slugs. Neville
Colemanís Underwater Geographic Pty Ltd, Australia.144pp.