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Science. 1999 Mar 19;283(5409):1919-23.

Acoel flatworms: earliest extant bilaterian Metazoans, not members of Platyhelminthes.

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  • 1Departament de Genètica, Facultat de Biologia, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain.

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  • Science 1999 Apr 9;284(5412):264.

Abstract

Because of their simple organization the Acoela have been considered to be either primitive bilaterians or descendants of coelomates through secondary loss of derived features. Sequence data of 18S ribosomal DNA genes from non-fast evolving species of acoels and other metazoans reveal that this group does not belong to the Platyhelminthes but represents the extant members of the earliest divergent Bilateria, an interpretation that is supported by recent studies on the embryonic cleavage pattern and nervous system of acoels. This study has implications for understanding the evolution of major body plans, and for perceptions of the Cambrian evolutionary explosion.

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PMID:
10082465
[PubMed - indexed for MEDLINE]
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