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Phylum Mollusca > Class Gastropoda > sea slugs > Order Nudibranchia
Blue-spot nudibranch
Dendrodoris krusensternii
Family Dendrodorididae
updated Sep 12
Where seen? This delightfully bobbled nudibranch with electric blue spots is sometimes seen among seagrasses and seaweeds on our Northern shores, as well as at Cyrene Reef. Often seen in numbers, and then not seen again for some time. It was previously Dendrodoris denisoni.

Features: 5-10cm long. Broad, soft body with lots of bumps and pimples, and distinctive electric blue spots. Thick club-like rhinophores and large feathery gills. The animal is generally beige sometimes with a purplish or pinkish tinge. Younger animals may be more colourful than older ones. Some members of this family can cause irritation to eyes and a burning sensation to the skin.

What does it eat? It eats sponges, possibly sponges that live in murky, mucky sites. It lacks a radula and jaws so it can't rasp or chew its food sponge. Instead, it secretes digestive juices onto the sponge and then sucks up the softened sponge. How is it the juices don't leak away into the surrounding water? Dr Bill Rudman explains on his website about how structures around the mouth might help it form a seal around the feeding site.

Pulau Sekudu, May 05

Egg ribbon being laid.
Sisters Island, Apr 14

Mating pair?
Pulau Sekudu, Oct 11

Beting Bronok, Jul 07


Cyrene, Jul 09

Frilly gills.

Pulau Sekudu, Apr 06

Mating and laying eggs.
Photos shared by Loh Kok Sheng on his blog.

Blue-spot nudibranchs on Singapore shores

Photos for free download from wildsingapore flickr

more photos of blue-spot nudibranchs on Singapore shores

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