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Science 17 March 1995:
Vol. 267. no. 5204, pp. 1641 - 1643
DOI: 10.1126/science.7886451
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Articles

Science, Vol 267, Issue 5204, 1641-1643
Copyright © 1995 by American Association for the Advancement of Science

articles

Evidence from 18S ribosomal DNA that the lophophorates are protostome animals

KM Halanych, JD Bacheller, AM Aguinaldo, SM Liva, DM Hillis, and JA Lake

Department of Zoology, University of Texas, Austin 78712.

The suspension-feeding metazoan subkingdom Lophophorata exhibits characteristics of both deuterostomes and protostomes. Because the morphology and embryology of lophophorates are phylogenetically ambiguous, their origin is a major unsolved problem of metazoan phylogenetics. The complete 18S ribosomal DNA sequences of all three lophophorate phyla were obtained and analyzed to clarify the phylogenetic relationships of this subkingdom. Sequence analyses show that lophophorates are protostomes closely related to mollusks and annelids. This conclusion deviates from the commonly held view of deuterostome affinity.


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