ascidians text index | photo index
Phylum Chordata | Subphylum Tunicata/Urochordata | Class Ascidiacea
Pink ascidians
Eudistoma sp.
Family Polycitoridae

updated Nov 2019
Where seen? Small clusters of these bright pink ascidians are sometimes seen on coral rubble on our Southern shores. Larger patches of pink coloured blobs were also seen in the past on the jetty pilings of Chek Jawa.

Features: Clusters of a few irregular blobs about 1-2cm long usually bright pink. Sometimes, much larger blobs 4-5cm are seen. Each blob appears to be made up of many individual zooids embedded in a common tissue.

In Serina Lee's article, the photo of Eudistoma laysani closely resembles these animals.

The Racing-stripe flatworm (Pseudoceros bifurcus) and other flatworms have been seen on top of it. Possibly eating the ascidians.

Cyrene Reef, Nov 08

Sisters Island, May 07

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

Pink ascidians on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores

Pulau Tekukor, Aug 17
Photo shared by Teo Say Chong on facebook.

Kusu Island, Dec 18
Photo shared by Liz Lim on facebook.

Pulau Semakau South, Oct 18
Photo shared by Chong SiewMin on facebook.

Pulau Salu, Jun 10

Grateful thanks to Rene Ong for pointing out the identification of these animals.


  • Various Eudistoma sp. in the Family Polycitoridae on The Biodiversity of Singapore website of the Lee Kong Chian Natural History Museum.


  • Serina S-C Lee, Janlin Y-H Chan, Serena L-M Teo & Gretchen Lambert. State of knowledge of ascidian diversity in South China Sea and new records for Singapore. 29 June 2016. Raffles Bulletin of Zoology Supplement No. 34: 718–743.
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