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Phylum Mollusca > Class Gastropoda > sea slugs > Order Nudibranchia
Sponge nudibranch
Atagema spongiosa
Family Discodorididae
updated Oct 2016
Where seen? Resembling a sponge, this large well camouflaged nudibranch is sometimes seen our undisturbed Northern shores among coral rubble. Appears to be seasonally common. It was formerly known as Trippa spongiosa.

Features: 8-12cm long. Boday heavy with a hump in the middle, it looks like a dull sponge with regular dark coloured 'holes' on the sides. Body in various dull colours. Gills large feathery, rhinophores large when fully extended. The underside of the body is dark to deep purple. When disturbed, it can drop off parts of its body. Its egg mass looks like rosette of frilly ribbon.

Laying eggs.
Chek Jawa, Jun 05

Egg mass.


Feathery gills.

Changi, Jul 07

Sponge nudibranchs on Singapore shores

Photos of Sponge nudibranchs for free download from wildsingapore flickr

Distribution in Singapore on this wildsingapore flickr map

Chek Jawa, Jul 16
Photo shared by Marcus Ng 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.
  • 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.
  • Coleman, Neville. 2001. 1001 Nudibranchs: Catalogue of Indo-Pacific Sea Slugs. Neville Coleman's Underwater Geographic Pty Ltd, Australia.144pp.
  • Coleman, Neville, 1989. Nudibranchs of the South Pacific Vol 1. 64 pp.
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