flatworms text index | photo index
worms > Phylum Platyhelminthes > Class Turbellaria > Order Polycladida
Bayer's flatworm
Nymphozoon bayeri
Family Pseudocerotidae
updated Feb 2020

Where seen? This bold black-and-white flatworm is sometimes seen encountered on coral rubble near living reefs.

Features: 5-8cm long. Usually with deep ruffles. Body dark grey or brown. Distinguished by wide black margin with inner bright white margin. Along the middle of the body, one wide black stripe bordered on both sides by a continuous white edge. Underside uniformly greyish with whitish margin next to black outer margin. It has a pair of pseudotentacles at the front made up of simple folded edges of the body, with white tips.

Sometimes mistaken for the Brown-stripe flatworm which has a paler brown body and does not have inner bright white margins.

Pulau Hantu, Apr 06

Pseudotentacles are simple folded edges of the body with white tips.

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

Bayer's flatworms on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores

Chek Jawa, Jul 18
Photo shared by Jianlin Liu on facebook.

Beting Bronok, Jul 20
Photo shared by Loh Kok Sheng on facebook.

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

Tanah Merah, May 14
Shared by Loh Kok Sheng on his blog.

Tanah Merah, Jan 10
Photo shared by Loh Kok Sheng on flickr.

East Coast (PCN), May 21
Photo shared by Jonathan Tan on facebook.

Pulau Berkas, May 10
Photo shared by Marcus Ng on flickr.

Pulau Salu, Apr 21
Shared by Loh Kok Sheng on facebook.

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.
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