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worms > Phylum Platyhelminthes > Class Turbellaria > Order Polycladida
Ocher-striped flatworm
Pseudoceros rubrotentaculatus
Family Pseudocerotidae
updated Feb 2020

Where seen? This small white flatworm with three stripes and red tipped pseudotentacles is sometimes seen on many of our shores, on coral rubble near living reefs.

Features: 2-4cm long. Body creamy-white with a blue margin. It has three non-connecting lines along the centre of the body, each line ocher bordered dark brown or purplish brown. There is a pair of pseudotentacles made up of simple folded edges of the body, with orange tips.

Sometimes mistaken for similar flatworms. Here's more on how to tell apart small flatworms with one central line and three central lines.

Big Sisters Island, Jan 20
Photo shared by Rene Ong on facebook.

Pseudotentacles with orange tips.

Sisters Island, Jan 06

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

Ocher-striped flatworms on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores

Pulau Tekukor, Nov 20
Photo shared by Jianlin Liu on facebook.

Pulau Tekukor, Jan 17
Photo shared by Richard Kuah on facebook.

Big Sisters Island, Feb 22
Photo shared by Toh Chay Hoon on facebook.

Lazarus Island, Jan 24
Photo shared by Loh Kok Sheng on facebook.

Pulau Semakau East, Jun 15
Photo shared by Toh Chay Hoon on facebook.

Pulau Jong, May 24
Photo shared by Tammy Lim on facebook.

With grateful thanks to Leslie H. Harris of the Natural History Museum of Los Angeles County for comments on this worm and its identification.
Grateful thanks to Rene Ong for sharing details and identifying the flatworms on this page.

  • 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, 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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