Phylogenetic Position of the Dicyemid Mesozoa Inferred from 18S rDNA Sequences
نویسندگان
چکیده
منابع مشابه
Origin of the Mesozoa inferred from 18S rRNA gene sequences.
The phylum Mesozoa comprises small, simply organized wormlike parasites of marine invertebrates and is composed of two classes, the Rhombozoa and the Orthonectida. The origin of Mesozoa is uncertain; they are classically considered either as degenerate turbellarians or as primitive multicellular animals related to ciliated protists. In order to precisely determine the phylogenetic position of t...
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Primitive platyhelminths, especially Acoel turbellarians, are thought to be key to understanding the origin and evolution of metazoa. In order to infer their phylogenetic position within the phylum Platyhelminths, we determined and compared the complete nucleotide sequence of a region of about 750 base pairs in the central part of an 18S rDNA for ten turbellarians, including two species of the ...
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Maximum likelihood trees produced from 18S rDNA sequences separated 14 Xiphinema and five Xiphidorus nematode species from Brazil into distinct groups that concurred with their current morphological taxonomic status. Species belonging to the X. americanum group (X. brevicolle, X. diffusum, X. oxycaudatum, and X. peruvianum) formed a single group that was clearly separated from the other Xiphine...
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ژورنال
عنوان ژورنال: The Biological Bulletin
سال: 1995
ISSN: 0006-3185,1939-8697
DOI: 10.2307/1542458