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Flatworms
Flatworms (phylum Platyhelminthes) may be more frequently mistaken for sea slugs than any other animals. Some of them are brilliantly colored and many have folds of the body margin or small projections from the dorsal surface that resemble rhinophores. A few even have elongate papillae on the dorsal surface that may be mistaken for cerata. However, they are usually proportionately flatter and move more rapidly than sea slugs (either by ciliary action or undulation). They lack the molluscan foot and an anus. All or nearly all are predators and some of the larger species may feed on sea slugs. Others mimic sea slugs that concentrate toxic or distasteful chemicals from their food. Most of those that are readily mistaken for sea slugs are in the order Polycladida.

A few of the species most frequently mistaken for sea slugs:
Pseudoceros-cf-dimidiatus
Pseudoceros cf. dimidiatus
PF; La Perouse Bay, Maui

Pseudobicero gratus
Pseudobiceros gratus
CP: Hekili Point, Maui;
March 30, 2007
Pseudoceros ferrugineus
Pseudoceros ferrugineus
PF: Makena, Maui;
Sept. 20, 2008

Pseudobiceros sp. #5
Pseudobiceros sp. #5
CP: Maui;
May, 2005

Pseudobiceros sp. #14
Pseudobiceros sp. #14
CP: Hekili Point, Maui;
March 23, 2007
Thysanozoon tentaculum
Thysanozoon tentaculum
CP: Maalaea Bay, Maui;
Oct. 22, 2007
For more information see:
 
John Hoover's flatworm page
 
Keoki Stender's flatworm page

Marshall Islands Flatworms by Scott & Jeanette Johnson
 
The flatworm page at Nudipixel
 
Wolfgang Seifarth's flatworm page
 
Gustav Paulay's Guam flatworms
 
Flatworms on the Sea Slug Forum
 
Caribbean flatworms by Marian K. Litvaitis
 
Discover Life flatworm pages by Marian K. Litvaitis
 
Flatworms at Umiushi-zukan

Reunion Flat Worms by Philibert Bidgrain

Guam Flat Worms by Dave Burdick

Flatworms by Teresa Zubi

Australian flatworms by Denis Riek

Marine flatworms by Jim Anderson
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