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worms > Phylum Platyhelminthes > Class Turbellaria > Order Polycladida
Vermilion flatworm
Phrikoceros baibaiye
Family Pseudocerotidae
updated Oct 2016

Where seen? This small colourful flatworm is sometimes seen on coral rubble on some of our shores. More active at night, but sometimes seen moving about during the day. Usually, many individuals are seen, and then not seen again for a long time.

Features: 3-4cm long. The small flatworm is plain red or orange (also described elsewhere as orange-brown or rusty) with tiny white dots all over the upper surface (underside uniformly plain without dots). The body margin is often highly ruffled and has no coloured margin. It has a pair of erect pseudotentacles at the front made up of folded edges of the body. The pseudotentacles are square and ruffled sideways. There is a short white line at the head. The mouth appears to the near the centre of the underside of the body.

Little ruby flatworms are active and fast moving, often ruffling out from one crevice to another among coral rubble. They may even swim for a short distance with vigorous ripples of their body edges. When they are in season, some may be seen stranded on sand. Please watch your step!

Cyrene Reef, Jun 10

Pulau Sekudu, Jul 05

Pulau Semakau, Aug 11
Photo shared by Lok Kok Sheng on his blog.

Chek Jawa, Oct 10
Photo shared by Neo Mei Lin on her blog.

Pulau Semakau, Aug 10
Photo shared by Neo Mei Lin on her blog.

Vermilion flatworms on Singapore shores

Photos of Vermilion flatworms for free download from wildsingapore flickr

Distribution in Singapore on this wildsingapore flickr map

Cyrene Reef, Aug 12
Photo shared by Lok Kok Sheng on his blog.

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

Cyrene Reef, Feb 16
Photo shared by Lok Kok Sheng on his blog.

Pulau Semakau, Aug 10, shared by Marcus Ng


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


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