Relations of the new phylum Cycliophora

B. M. H. Winnepenninckx (), T. Backeljau () and R. M. Kristensen
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B. M. H. Winnepenninckx: Royal Belgian Institute of Natural Sciences
T. Backeljau: Royal Belgian Institute of Natural Sciences
R. M. Kristensen: Zoological Museum, University of Copenhagen

Nature, 1998, vol. 393, issue 6686, 636-638

Abstract: Abstract The Cycliophora is the most recently described animal phylum and is based on a single species, Symbion pandora, which was discovered on the mouthparts of the Norway lobster Nephrops norvegicus1. Because only a few morphological data1,2,3 are available for Symbion, the precise nature of its phylogenetic relationships is highly controversial2,4,5. Here we present a phylogenetic analysis of 18S ribosomal RNA sequence data, including a new Symbion sequence, which places Symbion in a lophophorate-aschelminth-protostome clade and which suggests a sister-group relationship between Cycliophora and a Rotifera-Acanthocephala clade.

Date: 1998
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DOI: 10.1038/31377

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