ascidians text index | photo index
Phylum Chordata | Subphylum Tunicata/Urochordata | Class Ascidiacea
Bubble ascidians
awaiting identification*
updated Nov 2019
Where seen? These clusters of translucent bubble-like animals are sometimes seen on and under rocks and stones on our shores.

1-3cm. A smooth translucent bubble with two openings at the top, sometimes with a colourful ring around the openings. Many bubbles are found clustered together.

The ones with the blue lines look like Clavelina sp., Family Clavelinidae
in The Biodiversity of Singapore. The ones with an orange rings look like the photos of Ecteinascidia thurstoni, Family Perophoridae in The Biodiversity of Singapore and Serina Lee's article.

Pulau Sekudu, May 12

Ecteinascidia thurstoni?
Sisters Island, Aug 12

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

Bubble ascidians on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores

Ecteinascidia thurstoni?
Pulau Sekudu, Jun 18
Photo shared by Loh Kok Sheng on facebook.



  • 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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