Molecular phylogeny of early vertebrates: monophyly of the agnathans as revealed by sequences of 35 genes

Extant vertebrates are divided into three major groups: hagfishes (Hyperotreti, myxinoids), lampreys (Hyperoartia, petromyzontids), and jawed vertebrates (Gnathostomata). The phylogenetic relationships among the groups and within the jawed vertebrates are controversial, for both morphological and mo...

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Published inMolecular biology and evolution Vol. 20; no. 2; pp. 287 - 292
Main Authors Takezaki, Naoko, Figueroa, Felipe, Zaleska-Rutczynska, Zofia, Klein, Jan
Format Journal Article
LanguageEnglish
Published United States 01.02.2003
Subjects
Animals
Evolution, Molecular
Hagfishes - genetics
Lampreys - genetics
Models, Statistical
Phylogeny
Species Specificity
Vertebrates - genetics
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Summary:Extant vertebrates are divided into three major groups: hagfishes (Hyperotreti, myxinoids), lampreys (Hyperoartia, petromyzontids), and jawed vertebrates (Gnathostomata). The phylogenetic relationships among the groups and within the jawed vertebrates are controversial, for both morphological and molecular studies have rendered themselves to conflicting interpretations. Here, we use the sequences of 35 nuclear protein-encoding genes to provide definitive evidence for the monophyly of the Agnatha (jawless vertebrates, a group encompassing the hagfishes and lampreys). Our analyses also give a strong support for the separation of Chondrichthyes (cartilaginous fishes) before the divergence of Osteichthyes (bony fishes) from the other gnathostomes.
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ISSN:0737-4038
1537-1719
DOI:10.1093/molbev/msg040