Abstract:
:The Orthonectida is a small, poorly known phylum of parasites of marine invertebrates. Their phylogenetic placement is obscure; they have been considered to be multicellular protozoans, primitive animals at a "mesozoan" grade of organization, or secondarily simplified flatworm-like organisms. The best known species in the phylum, Rhopalura ophiocomae, was collected on San Juan Island, Wash. and a complete 18S rDNA sequence was obtained. Using the models of minimum evolution and parsimony, phylogenetic analyses were undertaken and the results lend support to the following hypotheses about orthonectids: (1) orthonectids are more closely aligned with triploblastic metazoan taxa than with the protist or diploblastic metazoan taxa considered in this analysis; (2) orthonectids are not derived members of the phylum Platyhelminthes; and (3) orthonectids and rhombozoans are not each other's closest relatives, thus casting further doubt on the validity of the phylum Mesozoa previously used to encompass both groups.
journal_name
Mol Biol Evoljournal_title
Molecular biology and evolutionauthors
Hanelt B,Van Schyndel D,Adema CM,Lewis LA,Loker ESdoi
10.1093/oxfordjournals.molbev.a025683subject
Has Abstractpub_date
1996-11-01 00:00:00pages
1187-91issue
9eissn
0737-4038issn
1537-1719journal_volume
13pub_type
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doi:10.1093/molbev/msj023
更新日期:2006-01-01 00:00:00
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journal_title:Molecular biology and evolution
pub_type: 杂志文章
doi:10.1093/oxfordjournals.molbev.a026295
更新日期:2000-12-01 00:00:00
abstract::Estimation of evolutionary distances from coding sequences must take into account protein-level selection to avoid relative underestimation of longer evolutionary distances. Current modeling of selection via site-to-site rate heterogeneity generally neglects another aspect of selection, namely position-specific amino ...
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pub_type: 杂志文章
doi:10.1093/oxfordjournals.molbev.a025995
更新日期:1998-07-01 00:00:00
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