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Very long ribbon worm
Baseodiscus delineatus*
Family Valenciniidae
updated Oct 2019

Where seen? This amazingly long ribbon worm is sometimes seen in coral rubble areas on our Southern shores. Sometimes several are seen on the same visit!

Features: About 40cm to more than 1m long. White to cream body, with five or more blue or black stripes along the entire length of the body.

It is often seen oozing about, purposefully but not quickly. It never seems to be in a hurry and doesn't retract immediately into a hiding place even when a visitor splashes about near it.

Pulau Sudong, Dec 09

Pulau Sudong, Dec 09

Very long ribbon worm (Baseodiscus delineatus)

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

Very long ribbon worms on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores

Sentosa Serapong, May 17
Photo shared by Abel Yeo on facebook.

Lazarus, Feb 19
Photo shared by Jianlin Liu on facebook.

Cyrene Reef, Jun 10
Photo shared by Loh Kok Sheng on his flickr.

Little Sisters Island, Feb 15
Photo shared byToh Chay Hoon on facebook.

Sisters Island, Dec 10
Photo shared by James Koh on his blog.

Sisters Island, May 09
Photo shared by Loh Kok Sheng on his blog.

Pulau Hantu, Jul 10
Photo shared by Toh Chay Hoon on her blog.

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

Pulau Semakau, Nov 09
Photo shared by James Koh on his blog.

Terumbu Raya, Jun 20
Photo shared by Vincent Choo on facebook.

Beting Bemban Besar, Mar 17
Photo shared by Richard Kuah on facebook.

Terumbu Berkas, Jan 10

Terumbu Bemban, Jul 18
Photo shared by Liz Lim on facebook.

Pulau Pawai, Dec 09
Photo shared by Loh Kok Sheng on his flickr.

Pulau Pawai, Dec 09
Photo shared by James Koh on his flickr.

Terumbu Pempang Laut, Apr 11
Ribbon worm from Loh Kok Sheng on Vimeo.

Terumbu Pempang Tengah, Nov 18

St John's Island, Jan 20

With grateful thanks to Leslie H. Harris of the Natural History Museum of Los Angeles County for comments on the ID of this worm.



  • 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.
  • Humann, Paul and Ned Deloach. 2010. Reef Creature Identification: Tropical Pacific New World Publications. 497pp.
  • Kuiter, Rudie H and Helmut Debelius. 2009. World Atlas of Marine Fauna. IKAN-Unterwasserachiv. 723pp.
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