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.
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
his website about how structures around the mouth might help it
form a seal around the feeding site.
Pulau Sekudu, May 05
Pulau Sekudu, Oct 11
Beting Bronok, Jul 07
Cyrene, Jul 09
Pulau Sekudu, Apr 06
Mating and laying eggs.
Photos shared by Loh Kok Sheng on his
nudibranchs on Singapore shores
photos of denisoni's nudibranchs on Singapore shores
- 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.
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.
Neville. 2001. 1001
Nudibranchs: Catalogue of Indo-Pacific Sea Slugs. Neville
Coleman’s Underwater Geographic Pty Ltd, Australia.144pp.
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.