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Phylum Mollusca > Class Gastropoda > sea slugs > Order Nudibranchia
Black prickly nudibranch
Atagema intecta
Family Discodorididae

updated May 2020

Where seen? This black nudibranch with prickly bumps is sometimes seen on some of our shores, on coral rubble. It was previously known as Trippa intecta.

Features: Variable in size, sometimes 1cm long, others up to 6cm long. Very dark maroon, almost black. There are tiny prickly bumps all over its body. The feathery gills appears similar to the rest of the body. The species should have a line of pale or beige bumps along the upper body length, but few of those seen had this. The foot has small white spots on the upperside and is smooth and lighter on the underside.
Chek Jawa, Jul 05

Smooth foot on the underside
Tiny one about 1cm long.
Sentosa, Oct 04

Black prickly nudibranchs on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores

Changi Loyang, May 21
Photo shared by Jianlin Liu on facebook.

Changi, Dec 18
Photo shared by Abel Yeo on facebook.

Chek Jawa, Oct 10
Photo shared by Neo Mei Lin on her blog.

Pulau Sekudu, Jul 09
Photo shared by Marcus Ng on his flickr.

Tanah Merah, Jul 09

Photo shared by James Koh on his blog.

Sentosa Tg. Rimau, Jan 18
Photo shared by Abel Yeo on facebook.

East Coast (PCN), May 21
Photo shared by Vincent Choo on facebook.

Sentosa Tg Rimau, Nov 21
Photo shared by Jianlin Liu on facebook.

St. John's Island, Apr 22
Photo shared by Jianlin Liu on facebook.

Pulau Hantu, Sep 10

Photo shared by Toh Chay Hoon on her blog.

Pulau Semakau, Feb 08
Photo shared by Toh Chay Hoon on her 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.
  • Debelius, 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. 497pp.
  • Coleman, Neville. 2001. 1001 Nudibranchs: Catalogue of Indo-Pacific Sea Slugs. Neville Coleman's Underwater Geographic Pty Ltd, Australia.144pp.
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