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Phylogenomic Resolution of the Hemichordate and Echinoderm Clade
Swedish Museum of Natural History, Department of Zoology. Auburn University.
University of Queensland.
Auburn University.
Georgia College and State University.
Show others and affiliations
2014 (English)In: Current Biology, ISSN 0960-9822, E-ISSN 1879-0445, Vol. 24, 2827-2832 p.Article in journal (Refereed) Published
Abstract [en]

Ambulacraria, comprising Hemichordata and Echinodermata, is closely related to Chordata, making it integral to understanding chordate origins and polarizing chordate molecular and morphological characters. Unfortunately, relationships within Hemichordata and Echinoder- mata have remained unresolved, compromising our ability to extrapolate findings from the most closely related molecular and developmental models outside of Chordata (e.g., the acorn worms Saccoglossus kowalevskii and Ptychodera flava and the sea urchin Strongylocentrotus purpuratus). To resolve long-standing phylogenetic issues within Ambulacraria, we sequenced transcriptomes for 14 hemichordates as well as 8 echinoderms and complemented these with existing data for a total of 33 ambulacrarian operational taxonomic units (OTUs). Examination of leaf stability values revealed rhabdopleurid pterobranchs and the enteropneust Stereobalanus canadensis were unstable in placement; therefore, analyses were also run without these taxa. Analyses of 185 genes resulted in reciprocal monophyly of Enteropneusta and Pterobranchia, placed the deep-sea family Torquaratoridae within Ptychoderidae, and confirmed the position of ophiuroid brittle stars as sister to asteroid sea stars (the Asterozoa hypothesis). These results are consistent with earlier perspectives concerning plesiomorphies of Ambulacraria, including pharyngeal gill slits, a single axocoel, and paired hydrocoels and somatocoels. The resolved ambulacrarian phylogeny will help clarify the early evolution of chordate characteristics and has implications for our understanding of major fossil groups, including graptolites and somasteroideans. 

Place, publisher, year, edition, pages
Elsevier, 2014. Vol. 24, 2827-2832 p.
Keyword [en]
Phylogenomics, Hemichordata, Echinodermata
National Category
Biological Systematics
Research subject
Diversity of life
Identifiers
URN: urn:nbn:se:nrm:diva-967DOI: 10.1016/j.cub.2014.10.016OAI: oai:DiVA.org:nrm-967DiVA: diva2:769511
Available from: 2014-12-08 Created: 2014-12-08 Last updated: 2015-02-02Bibliographically approved

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CiteExportLink to record
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