Blue-spot
nudibranch
Dendrodoris denisoni
Family Dendrodorididae
updated
May 2020
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.
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. |
Pulau Sekudu, May 05 |
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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 explainshow structures around the mouth might help it
form a seal around the feeding site. |
Tanah Merah, May 09 |
Underside. |
Beting Bronok, Jul 07
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Tiny one, hardly wider than a seagrass blade.
Cyrene Reef, Jun 08
Shared by Toh Chay Hoon on flickr.
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Laying eggs.
Sisters Island, Apr 14
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Blue-spot
nudibranchs on Singapore shores |
Other sightings on Singapore shores |
Punggol, Aug 20
Photo by Richard Kuah on facebook. |
Pasir Ris Park, Sep 20
Photos shared by Loh Kok Sheng on facebook. |
Changi, May 21
Photos shared by Loh Kok Sheng on facebook.. |
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Pulau Sekudu, Apr 06 |
Mating and laying eggs.
Photos shared by Loh Kok Sheng on his
blog. |
Chek Jawa, Jul 19
Photo
shared by Marcus Ng on flickr.
|
Diseased?
Tanah Merah, Dec 11
Photo
shared by James Koh on flickr |
|
Berlayar Creek, Oct 17
Photo
shared by Marcus Ng on flickr. |
A pair mating?
Tanah Merah, May 09
Photos shared by James Koh on flickr.
|
Tanah Merah, Dec 09
Photo
shared by James Koh on his
blog. |
|
Pulau Semakau, Nov 07
Photo
shared by Toh Chay Hoon on her
flickr. |
Pulau Semakau (South), Jan 22
Photo
shared by James Koh on facebook. |
|
Pulau Hantu, Jun 08
Photo
shared by Loh Koh Sheng on his
blog. |
Kusu Island, Sep 10
Photo
shared by Loh Kok Sheng on flickr.
|
Cyrene Reef, Dec 16
Photo
shared by Marcus Ng on flickr. |
|
Links
References
- 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.
- Coleman,
Neville. 2001. 1001
Nudibranchs: Catalogue of Indo-Pacific Sea Slugs. Neville
Coleman's Underwater Geographic Pty Ltd, Australia.144pp.
- Gosliner,
Terrence M., David W. Behrens and Gary C. Williams. 1996. Coral
Reef Animals of the Indo-Pacific: Animal life from Africa to Hawaii exclusive of the vertebrates
Sea Challengers. 314pp.
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