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Phylum Mollusca > Class Gastropoda > sea slugs > Order Nudibranchia
Cheesecake nudibranch
Doriprismatica atromarginata
Family Chromodorididae
updated May 2020
Where seen? This lemon yellow nudibranch with black-edged ruffles, resembles a slice of cheesecake. It has twitchy gills. Commonly encountered on many of our Southern shores, on rubble near reefs, sometimes in rather large numbers. It is also sometimes seen on our northern shores. It was previously known as Glossodoris atromarginata.

Features: 3-5cm long. A hard lemon-yellow body with an ruffled margin that is elegantly edged in black. It holds this portion of its body raised. The black edging is also found on the feathery gills and feathery rhinopores. There are black rings where the rhinophores emerge from the body.

Ruffle-edged body held raised.
St John's Island, May 05


Closeup of mouth and short oral tentacles.

Sisters Island, Jul 06

Feathery gills rotate constantly

St John's Island, May 05
The feathery gills rotate constantly to and fro. This is believed to help improve respiration as unlike most other nudibranchs which have thin body skins; the body skin of this nudibranch is rather thick and probably doesn't allow much secondary respiration to take place across the body skin.

What does it eat? It eats sponges. Neville Coleman notes it eating these sponges: Fasciospongia sp., Spongia sp. and Luffariella sp. Members of the Family Chromodorididae absorb the toxic chemicals in their sponge food and incorporate these chemicals into the mantle glands on their backs which act to repel predators.

Under this nudibranch, there was a bare spot ...

... does it eat encrusting coralline algae?
St John's Island, Jul 06


Hairy crab carrying the nudibranch, about to eat it?
Pulau Hantu, Jul 08


A mating mess?
Pulau Semakau, Nov 09

Tiny one.
St. John's Island, Nov 15

.

Cheesecake nudibranchs on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores


Changi, Aug 19
Photo shared by Loh Kok Sheng on facebook.

Changi, Jan 20
Photo shared by Jianlin Liu on facebook.

 



Beting Bronok, Jul 14
Photo shared by Loh Kok Sheng on his blog.

Beting Bronok, Jul 20
Photo shared by Vincent Choo on facebook.

 



Pulau Sekudu, May 12
Photo shared by James Koh on his blog.

Pulau Sekudu, May 15
Photo shared by Toh Chay Hoon on facebook.


East Coast Park Big Splash, Nov 16
Photo shared by Loh Kok Sheng on facebook.

Sentosa Serapong, Jul 15
Photo shared by Jonathan Tan on facebook..


Pulau Tekukor, Sep 18
Photo shared by Dayna Cheah on facebook..



Seringat Kias, Nov 19
Photo shared by Marcus Ng on facebook..

Lazarus, Jun 09
Photo shared by James Koh on his blog.

Terumbu Selegie, Jun 11
Photo shared by Loh Kok Sheng on his blog.


Terumbu Hantu, Jun 16
Photo shared by Loh Kok Sheng on flickr.

South Cyrene, Oct 10
Photo shared by Loh Kok Sheng on flickr.
 


Pulau Semakau North, Jul 15
Photo shared by Loh Kok Sheng on facebook..

Beting Bemban Besar, May 10
Photo shared by James Koh on his blog.

Terumbu Bemban, Jun 15
Photo shared by Marcus Ng on facebook.


Terumbu Pempang Darat, Jun 10
Photo shared by James Koh on his blog.

Terumbu Pempang Laut, May 15
Photo shared by Heng Pei Yan on facebook.

Terumbu Pempang Laut, Dec 18
Photo shared by Jianlin Liu on facebook.


Raffles Lighthouse, Jul 06
Photo shared by Toh Chay Hoon on her flickr.

Pulau Biola, Dec 09
Photo shared by James Koh on his flickr.

Pulau Biola, May 10


Pulau Salu, Apr 21

Photo shared by Loh Kok Sheng on facebook.

Pulau Berkas, May 10
Photo shared by Loh Kok Sheng on his flickr.

Pulau Senang, Jun 10
Photo shared by Toh Chay Hoon on her flickr.

Filmed at Terumbu Bemban Jun 10

3 Black-margined nudibranch together from Loh Kok Sheng on Vimeo.


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.
  • Chou, L. M., 1998. A Guide to the Coral Reef Life of Singapore. Singapore Science Centre. 128 pages.
  • Debelius, Helmut, 2001. Nudibranchs and Sea Snails: Indo-Pacific Field Guide IKAN-Unterwasserachiv, Frankfurt. 321 pp.
  • Coleman, Neville, 1989. Nudibranchs of the South Pacific Vol 1. 64 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.
  • 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.
  • Gosliner, Terrence M., David W. Behrens and Gary C. Williams. 1996. Coral Reef Animals of the Indo-Pacific: Animal life from Africa to Hawai'i exclusive of the vertebrates Sea Challengers. 314pp.
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