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Worms > Phylum Platyhelminthes > Class Turbellaria > Order Polycladida
Photo index of marine flatworms on Singapore shores

size in length of the worm

Spangled flatworm
Acanthozoon sp.

Persian carpet flatworm
Pseudobiceros bedfordi

Brilliant flatworm
Pseudobiceros fulgor

Olive flatworm
Tytthosoceros lizardensis

Starry flatworm
Pseudoceros stellae
8-12cm. Black with bluish white margin, and many tiny spots and raised bumps in white, yellow or orange. Coral rubble near living reefs. Commonly seen on our Southern shores. 8-10cm. Brown with rich patterns of curving stripes in white and rose pink, from the centre of the body to the sides. Coral rubble near living reefs. Sometimes seen on our Southern shores. 8-10cm. Dark brown with fine light to maroon striping from the centre of the body to sides like the veins of a leaf. Among coral rubble. Rarely seen, so far only on Chek Jawa. 8-10cm. Mottled brown or dark-green. Fine white and black edge. Sometimes seen on our Southern shores. 4-8cm. Brown with white spots and line of crowded white spots along the centre and along body edges. Near living reefs. Sometimes seen in numbers on our Southern shores.

Punctuated flatworm
Maritigrella fuscopuntata

Red-lined flatworm
Maritigrella virgulata

Feline flatworm
Pseudoceros felis

Damawan flatworm
Pseudobiceros damawan

Marbled flatworm
awaiting identification
5-7cm. Beige with a pattern of black bars along the edges, plain centre with faint reticulated pattern. Coral rubble near living reefs. Sometimes seen on some of our shores. 5-7cm. Beige with a pattern of black bars along the edges, thin broken red line along the centre. Coral rubble near living reefs. Sometimes seen on some of our shores. 8-10cm long. Body with thin black bordered solid orange margin and long narrow white bars. Near reefs. Rarely seen on the intertidal. 8-10cm long. Body with thin black margin and wider orange margin crossed with white bars and tiny black spots. Near reefs. Rarely seen on the intertidal. 1-3cm long. Body with thin orange margin and dark blotches at the edges. Seen on Beige ascidians under stones on Northern shores.

Dawn flatworm
Pseudobiceros
hancockanus

Halloween flatworm
awaiting
identfication

Silver-lining flatworm
awaiting
identfication

Sapphire flatworm
Pseudoceros
caeruleocinctus
 
5-8cm. Dark brown to black with narrow orange border on a transparent whitish edge. Coral rubble near living reefs. Sometimes seen on many of our Southern shores. 5-8cm. Black with a margin of orange and white. Reefs. 5-8cm. Black with a margin of yellow and white. Reefs. 4-5cm. Black with a border of blue and black. Reefs. Rarely seen.  

Orsak's flatworm
Nymphozoon orsaki

Pleasing flatworm
Pseudobiceros gratus

Bayer's flatworm
Nymphozoon bayeri
   
5-6cm. Pinkish cream with black and orange margin and thin white stripe down the middle. Sometimes seen on our southern shores. 5-8cm. Light brown to dark grey with darker brown margin and white-and-dark-brown stripe down the middle. Coral rubble near living reefs. Sometimes seen on our southern shores. 5-8cm. Dark brown to grey with black-and-whitemargin and white-and-black stripe down the middle. Coral rubble near living reefs. Sometimes seen on our southern shores.    

Purple-spotted
yellow flatworm
Pseudoceros
laingensis

Racing-stripe
flatworm

Pseudoceros
bifurcus

Triple-striped flatworm
Pseudoceros tristriatus

Elegant lined flatworm
Pseudoceros concinnus

Blue-dotted
flatworm

Pseudoceros indicus
4-6cm. Pale yellow with purple spotted margin and purple spots all over. Coral rubble. Sometimes seen on our northern shores. 4-5cm. Blue with distinctive stripe down the middle. Coral rubble near living reefs. Rarely seen. 2-4cm. White with blue margin and one to three blue stripes along the centre. Coral rubble near living reefs. Often seen on many of our shores. 2-4cm. White with blue margin and one blue stripe (stripe may have yellow centre) along the centre. Coral rubble near living reefs. Often seen on many of our shores. 2-3cm. White with blue spots along the margin. Rocky shores near living reefs, under stones. Sometimes seen on some of our northern shores.

Vermilion flatworm
Phrikoceros baibaiye

White flatworm
awaiting identification

Phlegm flatworm
awaiting identification

Silt flatworm
awaiting identification

Red mangrove flatworm
Limnostylochus sp.
3-4cm. Bright red with no other large markings. Coral rubble near living reefs. Sometimes seen on our Northern shores. 3-4cm long. White with broad white, orange and black, margins. 6-10cm. Beige, nearly transparent, internal parts sometimes visible. Rocky shore, on boulders or under stones. Sometimes seen on some of our Southern shores. 1.5-4cm. Sand or mud-coloured with speckles, seen on soft silty ground. Sometimes seen on some of our Northern shores. 2-3cm. Plain dark red, maroon or brown. Sometimes common in the back mangroves.
Not flatworms        

Acoel worms
awaiting identification
     
1cm or less. Brown sometimes with white stripe. Sometimes seen in large numbers on hard corals, anemone corals and corallimorphs. 1cm or less. Flat, colour and pattern matching host. Produces fine strings many times longer than the body. On leathery soft corals on our Southern shores.      

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

These are NOT flatworms

Ribbon worms
Phylum Nemertea

Nudibranchs
Phylum Mollusca

Onch slugs
Phylum Mollusca

Soles
Phylum Chordata
 
Much longer than broad. Common. They are ribbon worms. 1-10cm, not as flat as flatworms. Various shapes, colours and patterns. These are molluscs. 1-3cm, rounded. Common on rocky shores. These are molluscs. To 9cm. Common in seagrass areas. These are flatfishes.  

how to tell apart flatworms and slugs
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