Contents

19 March 1999
Vol 283, Issue 5409

About The Cover

Cover image expansion

COVER Molecular data indicate that acoel flatworms are not an order of the phylum Platyhelminthes, as previously thought, but are members of the earliest divergent Bilateria (hence an early evolutionary branch of triploblastic Metazoa). Acoels are characteristic in their lack of anatomical features, and few are as attractive as these, as yet unclassified, specimens (~6 mm long) found on coral at Ngerdwais, a coastal lagoon reef in Palau. See page1919.[Image: Coral Reef Research Foundation, Palau]