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Free Content Speciation and Time—Relationships of the Nemertines to the Acoelomate Metazoan Bilateria

The discovery of a marine nemertine, lacking a proboscis apparatus, in kelp holdfasts in New Zealand induces a re-evaluation of the phylum Nemertinea and its relationship to the Bilateria, Morphological features, which can be interpreted as primitive, are analyzed and a time frame for changes in the basic morphology is suggested.

Document Type: Research Article

Publication date: 01 September 1989

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