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Phylum Mollusca > Class Gastropoda > sea slugs > Order Nudibranchia
Cheesecake nudibranch
Doriprismatica atromarginata
Family Chromodorididae
updated Sep 12
Where seen? This lemon yellow nudibranch with black-edged ruffles that resembles a slice of cheesecake has twitchy gills! On rubble near reefs. Commonly encountered on many of our Southern shores, sometimes in rather large numbers. 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.

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.

Body held raised
St. John's Island, May 05

Black-tipped rhinophores

Sisters Island, Jul 06

Closeup of mouth and short oral tentacles.

Feathery gills rotate constantly

St. John's Island,Jun 07

Bare spot under the nudibranch,
does it eat encrusting coralline algae?

A mating mess?
Pulau Semakau, Nov 09

Cheesecake nudibranchs on Singapore shores

Photos of Cheesecake nudibranchs for free download from wildsingapore flickr

Distribution in Singapore on this wildsingapore flickr map

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

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

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

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

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

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

Sentosa Serapong, Jul 15
Photo shared byJonathan Tan on facebook..

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

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

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

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.

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, Jun 10

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

  • 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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