nudibranchs text index | photo index
Phylum Mollusca > Class Gastropoda > sea slugs > Order Nudibranchia > Suborder Aeolidina
Cuthona nudibranch
Cuthona sibogae
Family Tergipedidae
updated May 2020
Where seen? This beautiful nudibranch is sometimes seen at Beting Bronok, and often encountered by divers on our reefs.

Features: 2-3.5cm long. Long narrow, soft body with many long finger-like structures (called cerata) arranged in about 8 fan-like clusters along both sides of the body. It is distinguished by the purple body and yellow tips on the cerata with a band just below the tip. The rhinophores are slender and tipped reddish purple. It also has a pair of oral tentacles (like a moustache) which are also tipped reddish purple.

Sometimes mistaken for the blue dragon nudibranch which has purple bands on the oral tentacles.

What does it eat?
It eats hydroids, including the orange Fern hydroid (Sertularella sp.). According to Bill Rudman, it feeds on Sertularella quadridens.

Beting Bronok, Jul 05

Carrying eggs?

Beting Bronok, May 11

Beting Bronok, May 11

Cuthona nudibranchs on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores

Changi, Aug 19
Photo shared by Jianlin Liu on facebook.

Beting Bronok, May 11
Photo shared by James Koh on facebook.

St John's Island, Apr 21
Photo shared by Jianlin Liu on facebook.

  • 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.
  • Coleman, Neville. 2001. 1001 Nudibranchs: Catalogue of Indo-Pacific Sea Slugs. Neville Coleman's Underwater Geographic Pty Ltd, Australia.144pp.
  • Humann, Paul and Ned Deloach. 2010. Reef Creature Identification: Tropical Pacific New World Publications. 497pp.
  • 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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