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worms > Phylum Platyhelminthes > Class Turbellaria > Order Polycladida
Pleasing flatworm
Pseudobiceros gratus
Family Pseudocerotidae
updated Oct 2016

Where seen? This flatworm with a bold stripe down the centre is often encountered on coral rubble near living reefs. They appear to be seasonal, with several encountered during a visit, and then not at all for some time.

Features: 5-8cm long. Usually with deep ruffles. Body light brown with darker brown to black margins (no inner white margin). Center of the body raised with one dark brown stripe with diffuse white edges. Underside uniformly pale with narrow black margin and diffuse brown inner margin. It has a pair of erect pseudotentacles at the front made up of folded edges of the body. The tips of the pseudotentacles are black (none seen with white tips).

Sometimes mistaken for Bayer's flatworm (Nymphozoon bayeri) which has distinctive bright white margins inside the dark outer margin.

Sisters Islands, Mar 06
Head with pseudotentacles.
 

Pulau Hantu, Jan 06

Underside

Brown striped flatworms on Singapore shores

Photos of Brown striped flatworms for free download from wildsingapore flickr

Distribution in Singapore on this wildsingapore flickr map


Changi, Nov 13
Shared by Loh Kok Sheng on his blog.

Changi, Feb 09
Shared by Loh Kok Sheng on his blog.


Chek Jawa, Jan 14
Shared by Loh Kok Sheng on his blog.

Pulau Sekudu, Oct 11
Photo shared by Loh Kok Sheng on his blog.


Pulau Ubin, Dec 09
Shared by Loh Kok Sheng on his blog.

Changi, Feb 09
Shared by Loh Kok Sheng on his blog.


Beting Bronok, Nov 11
Shared by Loh Kok Sheng on his blog.

Tanah Merah, May 13
Shared by Loh Kok Sheng on his blog.

Labrador, Feb 09
Shared by Loh Kok Sheng on his blog.


Lazarus, Feb 09
Shared by Loh Kok Sheng on his blog.

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


Lazarus, Feb 09
Shared by Loh Kok Sheng on his blog.

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

Pulau Biola, Dec 09
Shared by Loh Kok Sheng on flickr.

Filmed on Labrador on 10 Feb 09

brown stripe flatworm @ labrador nature reserve 10Feb2009 from SgBeachBum on Vimeo.


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

Links

  • Pseudobiceros gratus on Encyclopedia of Life, LifeDesks, Marine Flatworms - Polycladida: Technical fact sheet.
  • Pseudobiceros gratus (Polycladida: Pseudocerotidae) Brown Stripped flatworm from Wesley Goi Chin Lui, 2011 on taxo4254.
References
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