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Phylum Mollusca > Class Gastropoda > sea slugs > Order Nudibranchia
Slender ceratosoma nudibranch
Ceratosoma gracillimum
Family Chromodorididae
updated Oct 2016

Where seen? This large chunky hard nudibranch is more commonly seen by divers and rarely seen on the intertidal.

Features: 6-8cm long. The body is stiff, long and narrow with a long tail. The stiff mantle has is smooth along the edge of the mantle from the head to the tail, except for a pair of elongated lobes which together with the tail forms a triangular area with the feathery gills in the middle. The large lobe is behind the gills. The front of the body generally wedged shaped.

Like other members of the Family Chromodorididae, the Ceratosoma nudibranch absorbs the toxic chemicals in their sponge food and incorporate these chemicals into the mantle glands. According to Bill Rudman, most species of Ceratosoma have a long 'horn' that stick out and curves towards the head. This acts as a defensive lure attracting and sacrificed to potential predators. This 'horn' contains most of the distasteful chemicals stored from the sponges that they feed on.

Sometimes mistaken for the 'Jolly Green Giant' nudibranch (Ceratosoma sinuatum) which has regular undulating lobes along the edge of the mantle from the head to the tail.

What does it eat? It is eats sponges.


Pulau Hantu, Jul 07
Photo shared by Toh Chay Hoon on flickr.


Terumbu Raya, May 09
Photo shared by Loh Kok Sheng on his blog.

Sentosa Serapong, May 12
Photo shared by Marcus Ng on facebook.

Pulau Hantu, Mar 08
Photo shared by Toh Chay Hoon on flickr.

Slender ceratosoma nudibranchs on Singapore shores

Photos of Slender ceratosoma nudibranchs for free download from wildsingapore flickr

Distribution in Singapore on this wildsingapore flickr map


Beting Bemban Besar, Jun 15
Photo shared by Toh Chay Hoon on facebook.

Beting Bemban Besar, Jun 15
Photo shared by Toh Chay Hoon on facebook.

St. John's Island, Feb 15
Photo shared by Neo Mei Lin on her blog.

Links

References

  • 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.
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