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Phylogenetics of Hydroidolina (Hydrozoa: Cnidaria)

Published online by Cambridge University Press:  29 July 2008

Paulyn Cartwright*
Affiliation:
Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, KS 66049, USA
Nathaniel M. Evans
Affiliation:
Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, KS 66049, USA
Casey W. Dunn
Affiliation:
Department of Ecology and Evolutionary Biology, Brown University, Providence RI 02912, USA
Antonio C. Marques
Affiliation:
Departamento de Zoologia, Instituto de Biociências, Universidade de São Paulo, São Paulo, SP, Brazil
Maria Pia Miglietta
Affiliation:
Department of Biology, Pennsylvania State University, University Park, PA 16802, USA
Peter Schuchert
Affiliation:
Muséum d'Histoire Naturelle, CH-1211, Genève, Switzerland
Allen G. Collins
Affiliation:
National Systematics Laboratory of NOAA Fisheries Service, NMNH, Smithsonian Institution, Washington, DC 20013, USA
*Corresponding
Correspondence should be addressed to: Paulyn Cartwright, Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, KS 66049, USA email: pcart@ku.edu

Abstract

Hydroidolina is a group of hydrozoans that includes Anthoathecata, Leptothecata and Siphonophorae. Previous phylogenetic analyses show strong support for Hydroidolina monophyly, but the relationships between and within its subgroups remain uncertain. In an effort to further clarify hydroidolinan relationships, we performed phylogenetic analyses on 97 hydroidolinan taxa, using DNA sequences from partial mitochondrial 16S rDNA, nearly complete nuclear 18S rDNA and nearly complete nuclear 28S rDNA. Our findings are consistent with previous analyses that support monophyly of Siphonophorae and Leptothecata and do not support monophyly of Anthoathecata nor its component subgroups, Filifera and Capitata. Instead, within Anthoathecata, we find support for four separate filiferan clades and two separate capitate clades (Aplanulata and Capitata sensu stricto). Our data however, lack any substantive support for discerning relationships between these eight distinct hydroidolinan clades.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2008

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