flatworms text index | photo index
worms > Phylum Platyhelminthes > Class Turbellaria > Order Polycladida
Damawan flatworm
Pseudobiceros damawan
Family Pseudocerotidae
updated Feb 2020

Where seen? Sometimes seen on remote reefs and also seen by divers on our reefs.

Features: 8-10cm long. Body mottled grey and white background with tiny black spots. Thin black margin and wider orange margin crossed with white bars. The middle of the body usually raised with a light white stripe along the length. The underside white with a wide orange and thin black margin. It has a pair of pseudotentacles that are squarish and ruffled on the sides.

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

Pseudotentacles squarish, ruffled on the sided.

Underside white with broad orange
and thin black margin.

Kusu Island, Feb 14
Photo shared by Heng Pei Yan on her blog.

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


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


  • 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.
  • Kuiter, Rudie H and Helmut Debelius. 2009. World Atlas of Marine Fauna. IKAN-Unterwasserachiv. 723pp.
links | references | about | email Ria
Spot errors? Have a question? Want to share your sightings? email Ria I'll be glad to hear from you!
wildfactsheets website©ria tan 2008