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Acoelomorph Flatworms
Acoelomorph flatworms (also referred to as acoelomate flatworms or acoels) were formerly placed in the phylum Platyhelminthes with the polyclads. However, recent DNA work has tended to place them in a separate group, the Acoelomorpha, more closely related to deuterostomes. They are typically very small (usually less than 5 mm) and lack the complex intestinal cavities of polyclads. They may be mistaken for small shell-less opisthobranchs but lack the well defined foot and other characteristics of such species.

Representative Hawaiian species (the third animal may not belong with this group):
unidentified aceol sp. #1
un. acoel sp. #1
CP: top & bottom: Hekili Point, Maui
April 9, 2007
Convoluta sp. #1
Convoluta sp. #1
CP: Hekili Point, Maui
Nov 22, 2006
unidendified acoel sp. #2
un. acoel(?) sp. #2
CP: Hekili Point, Maui
April 9, 2007
For more information see:

Acoelomorpha on Wikipedia
 
Flatworms on the Sea Slug Forum
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