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worms > Phylum Platyhelminthes > Class Turbellaria > Order Polycladida
Racing-stripe flatworm
Pseudoceros bifurcus
Family Pseudocerotidae
updated Oct 2016

Where seen? Like a blue race-car, this stunning flatworm is sometimes seen on coral rubble near living reefs.

Features: 4-5cm long. Sometimes with deep ruffles. Body background blue or pale blue becoming darker blue at the margin (elsewhere described as pale green, at the head tinged with mauve, purplish at the margin). It has a distinctive stripe that is white or yellow becoming orange or red near the head, with a thin black border. It has a pair of erect pseudotentacles at the front made up of folded edges of the body.

What does it eat?
It eats colonial ascidians, possibly the pink ascidian. It may have a more generalised diet, preying on a variety of ascidians.

Sisters Island, May 07

Tuas, Nov 03

About to eat the pink ascidian?
Terumbu Semakau, Dec 11
Photo shared by James Koh on his blog.

Is it eating this pink ascidian?

Racing-stripe flatworms on Singapore shores

Photos of Racing-stripe flatworms for free download from wildsingapore flickr

Distribution in Singapore on this wildsingapore flickr map

Changi, Jul 12
Photo shared by Neo Mei Lin on her blog.

St John's Island, May 09
Shared by Loh Kok Sheng on his blog.

St. John's Island, Aug 09
Shared by Toh Chay Hoon on her blog.

Sentosa Serapong, May 16
Photo shared by Marcus Ng on facebook.

Kusu Island, May 16
Photo shared by Loh Kok Sheng on facebook.

Kusu Island, Jan 14
Photo shared by Loh Kok Sheng on his blog.

Sisters Island, May 08
Photo shared by Loh Kok Sheng on his blog.

Sisters Island, Sep 10
Photo shared by Loh Kok Sheng on his flickr.

Cyrene Reef, Jul 08
Shared by Toh Chay Hoon on flickr.

Pulau Tekukor, May 10
Photo shared by Loh Kok Sheng on his blog.

Pulau Semakau, Feb 08
Shared by Lim Swee Cheng on his flickr.


  • Pseudoceros bifurcus on Encyclopedia of Life, LifeDesks, Marine Flatworms - Polycladida: Technical fact sheet.


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