Abstract:
:Phylogenetic relationships of nematodes, nematomorphs, kinorhynchs, priapulids, and some other major groups of invertebrates were studied by 18S rRNA gene sequencing. Kinorhynchs and priapulids form the monophyletic Cephalorhyncha clade that is the closest to the coelomate animals. When phylogenetic trees were generated by different methods, the position of nematomorphs appeared to be unstable. Inclusion of Enoplus brevis, a representative of a slowly evolving nematode lineage, in the set of analyzed species refutes the tree patterns, previously derived from molecular data, where the nematodes appear as a basal bilateral lineage. The nematodes seem to be closer to the coelomate animals than was speculated earlier. According to the results obtained, nematodes, nematomorphs, tardigrades, arthropods, and cephalorhynchs are a paraphyletic association of closely related taxa.
journal_name
J Mol Evoljournal_title
Journal of molecular evolutionauthors
Aleshin VV,Milyutina IA,Kedrova OS,Vladychenskaya NS,Petrov NBdoi
10.1007/pl00006416subject
Has Abstractpub_date
1998-11-01 00:00:00pages
597-605issue
5eissn
0022-2844issn
1432-1432journal_volume
47pub_type
杂志文章abstract::The mutation and selection of regulatory DNA sequences are presented as an ideal model system of molecular evolution where genotype, phenotype, and fitness can be explicitly and independently characterized. In this theoretical study, we construct an explicit model for the evolution of regulatory sequences, making use ...
journal_title:Journal of molecular evolution
pub_type: 杂志文章
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journal_title:Journal of molecular evolution
pub_type: 杂志文章
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abstract::EcoRI restriction of the B. nigra rDNA recombinants, isolated from a lambda genomic library, showed that the 3.9-kb fragment corresponded to the Intergenic Spacer (IGS), which was sequenced and found to be 3,928 bp in size. Sequence and dot-matrix analyses showed that the organization of the B. nigra rDNA IGS was typi...
journal_title:Journal of molecular evolution
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journal_title:Journal of molecular evolution
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journal_title:Journal of molecular evolution
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journal_title:Journal of molecular evolution
pub_type: 杂志文章
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更新日期:1998-04-01 00:00:00
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journal_title:Journal of molecular evolution
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journal_title:Journal of molecular evolution
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journal_title:Journal of molecular evolution
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journal_title:Journal of molecular evolution
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