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Phylum Mollusca > Class Gastropoda > sea slugs > Order Nudibranchia
Yellow-spotted gymnodoris nudibranchs
Gymnodoris sp.*
Family Gymnodorididae
updated May 2020
Where seen? These small nudibranchs with tiny yellow spots are sometimes seen on some of our shores.

Features: 1-2cm long. Body slender white, yellow or orange with yellow spots.

Sisters Island, Jan 06

Changi, Jun 06
There are several species of gymnodoris nudibranchs with yellow spots and they are rather difficult to tell apart in the field.

Gymnodoris ceylonica: According to Bill Rudman, it has a translucent white body with small bright orange-red spots; large gills with orange lines. It preys on the Long-tailed hairy sea hare (Stylocheilus longicauda). This nudibranch lays eggs in 'strings' that look more like sea hare egg masses. It is widespread in the Indo-West Pacific.

Gymnodoris alba: According to Bill Rudman, white with orange spots; an orange border on the mantle at the head, end of the foot has an orange tip, gills translucent, rhinophores translucted tipped orange. One was reported eating an aeolid nudibranch.

Gymnodoris citrina: According to Bill Rudman, they even cannibalise one another. In fact, during reproduction, one will eat the other as they mate!

Gymnodoris inornata: According to Bill Rudman, it ranges in colour from translucent yellow to deep reddish orange with slightly raised darker coloured bumps.

Cyrene Reef, Aug 11
Photo shared by Lok Kok Sheng on his blog.

Just laid egg string? Sentosa Tg Rimau, Nov 21
Photo shared by Lok Kok Sheng on facebook.

Big Sisters Island, May 13
Photo shared by Marcus Ng on flickr.

Pulau Sekudu, May 12
Photo shared by Toh Chay Hoon on facebook.
What do they eat? Gymnodoris species are described to be 'voracious predators' of other sea slugs like nudibranchs, sacoglossans and sea hares.
Gymnodoris eating another nudibranch! Filmed diving at Pulau Hantu, Oct 2019

*Species are difficult to positively identify without close examination.
On this website, they are grouped by external features for convenience of display.

Yellow-spotted gymnodoris nudibranchs on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores


Pulau Sekudu, Oct 11
Photo shared by Loh Kok Sheng on his blog.

Pulau Sekudu, Oct 11
Photo shared by Loh Kok Sheng on flickr.


Chek Jawa, Jun 21
Photo shared by Toh Chay Hoon on facebook.

Chek Jawa, Jul 18
Photo shared by Jianlin Liu on facebook.


Pulau Sekudu, Jul 16
Photo shared by Toh Chay Hoon on facebook.

Pulau Sekudu, May 10

Photo shared by Toh Chay Hoon on her blog.


Terumbu Selegie, Jan 17

Photo shared by Toh Chay Hoon on facebook.

Tanah Merah, Dec 11
Photo shared by James Koh on his blog.


Big Sisters Island, Jun 17
Photo shared by Marcus Ng on facebook.

Sentosa Tg Rimau, Nov 21

Photo shared by Jianlin Liu on facebook

 

Small Sisters Island, May 12
Photo shared by James Koh on flickr.


Pulau Tekukor, Nov 20
Photo shared by Jianlin Liu on facebook.

St John's Island, Jan 20
Photo shared by Jianlin Liu on facebook.

Kusu Island, Jul 20
Photo shared by Jianlin Liu on facebook.


Pulau Jong, Jul 12
Photo shared by Marcus Ng on flickr.

Pulau Jong, Nov 08
Shared by Toh Chay Hoon on flickr.


Pulau Hantu, Nov 09
Photo shared by James Koh on flickr.

Terumbu Bukom, Nov 10
Photo shared by Loh Kok Sheng on his blog.
 


Pulau Semakau South, Oct 20
Photo shared by Lok Kok Sheng on flickr.

Pulau Semakau, Aug 11
Photo shared by Lok Kok Sheng on his blog.

Pulau Semakau East, Jan 16
Photo shared by Loh Kok Sheng on facebook.



Pulau Biola, Jan 22
Photo shared by Toh Chay Hoon on facebook.


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.
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