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worms > Phylum Platyhelminthes > Class Turbellaria > Order Polycladida
Brown-stripe flatworm
Pseudobiceros sp. 2*
Family Pseudocerotidae
updated Feb 2020

Where seen? This brownish 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 to dark brown with darker brown to black narrow margins (no inner white margin). Center of the body raised with one dark brown line with diffuse white edges. Underside uniformly paler colouration with same margin as the upperside of the body. It has a pair of pseudotentacles at the front that are square, ear-like, with white tips.

Sometimes mistaken for Bayer's flatworm which has a dark body and distinctive bright white margins inside the dark outer margin.


Sisters Islands, Mar 06

Pseudotentacles square, ear-like.

Underside

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

Brown-stripe flatworms on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores


Changi, Jul 21
Shared by Jianlin LIu on facebook.


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

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


Pulau Ubin, Jul 17
Shared by Abel Yeo on facebook.

Pulau Ubin, Jul 17
Shared by Loh Kok Sheng on facebook.

 

Pulau Ubin, Dec 17
Shared by Abel Yeo on facebook.


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

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


Chek Jawa, Jul 18
Photo shared by Dayna Cheah on facebook.

Chek Jawa, Jul 18
Photo shared by Dayna Cheah on facebook.


Chek Jawa, Jul 18
Shared by Dayna Cheah on facebook.

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


Pulau Sekudu, Jun 17
Shared by Jianlin Liu on facebook.

Pulau Sekudu, Jun 17
Shared by Jianlin Liu on facebook.
 


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

Beting Bronok, Jul 20
Photo shared by JIanlin Liu on facebook. .


Beting Bronok, Jun 18
Photo shared by Loh Kok Sheng on facebook. .

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.

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


Kusu Island, Dec 18
Shared by Loh Kok Sheng on facebook.

Kusu Island, Dec 18
Shared by Loh Kok Sheng on facebook.


Kusu Island, May 22
Shared by Richard Kuah on facebook.


Small Sisters Island, May 18
Shared by Dayna Cheah on facebook..

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


Pulau Tekukor, Sep 18
Shared by Liz Lim on facebook.

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


Raffles Lighthouse, Jen 22
Shared by Vincent Choo on facebook.

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.

Grateful thanks to Rene Ong for sharing details and identifying the flatworms on this page.

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
  • Rene S.L. Ong and Samantha J.W. Tong. 29 October 2018. A preliminary checklist and photographic catalogue of polyclad flatworms recorded from Singapore. Nature in Singapore 2018 11: 77–125.
  • D. M. Bolaños, B. Q. Gan & R. S. L. Ong. 29 Jun 2016. First records of pseudocerotid flatworms (Platyhelminthes: Polycladida: Cotylea) from Singapore: A taxonomic report with remarks on colour variation.(pdf) The Raffles Bulletin of Zoology Supplement No. 34: 130-169  Pp. 130-169.
  • Newman, L.J. & Cannon, L.R.G. Nine new species of Pseudobiceros (Platyhelminthes: Polycladida) from Indo-Pacific. Pp. 341-368. in the Raffles Bulletin of Zoology vol 45.
  • Newman, Leslie and Lester Cannon. 2003. Marine Flatworms: The World of Polyclads. CSIRO Publishing. 97pp.
  • 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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