A molecular phylogenetic framework for the phylum Ctenophora using 18S rRNA genes

Mircea Podar; Steven H.D. Haddock; Mitchell L. Sogin; G. Richard Harbison

doi:10.1006/mpev.2001.1036

A molecular phylogenetic framework for the phylum Ctenophora using 18S rRNA genes

Mircea Podar, Steven H.D. Haddock, Mitchell L. Sogin, G. Richard Harbison

Research output: Contribution to journal › Article › peer-review

126 Scopus citations

Abstract

This paper presents the first molecular phylogenetic analysis of the phylum Ctenophora, by use of 18S ribosomal RNA sequences from most of the major taxa. The ctenophores form a distinct monophyletic group that, based on this gene phylogeny, is most closely related to the cnidarians. Our results suggest that the ancestral ctenophore was tentaculate and cydippid-like and that the presently recognized order Cydippida forms a polyphyletic group. The other ctenophore orders that we studied (Lobata, Beroida, and Platyctenida) are secondarily derived from cydippid-like ancestors, a conclusion that is also supported by developmental and morphological data. The very short evolutionary distances between characterized ctenophore 18S rRNA gene sequences suggests that extant ctenophores are derived from a recent common ancestor. This has important consequences for future studies and for an understanding of the evolution of the metazoans.

Original language	English
Pages (from-to)	218-230
Number of pages	13
Journal	Molecular Phylogenetics and Evolution
Volume	21
Issue number	2
DOIs	https://doi.org/10.1006/mpev.2001.1036
State	Published - 2001
Externally published	Yes

Funding

We thank our colleagues who helped us in this study: Dr. Igor Eeckhaut, Morgan Lidster, and Jonathan Martin for collecting and donating several specimens used in this study; Edie Widder for access to deep-sea specimens using the Johnson-Sea-Link submersible; Erik Zettler and the crew of Westward (Sea Education Association, Woods Hole) for support during collecting specimens in the Florida Keys and the Gulf Stream; Dr. Andrew McArthur (MBL, Woods Hole) for helpful discussions and advice with PAUP*; and the two anonymous reviewers for helpful suggestions. This research was supported by a WHOI Townsend postdoctoral scholarship to M.P. by the NASA Astrobiology Cooperative Agreement NCC2-1054 and continuing support from the Unger G. Vetlesen Foundation to M.L.S., and by the David and Lucille Packard Foundation to S.H.D.H. This is publication number 10474 of the Woods Hole Oceanographic Institution.

Funders	Funder number
David and Lucile Packard Foundation
National Aeronautics and Space Administration	NCC2-1054
G. Unger Vetlesen Foundation
Woods Hole Oceanographic Institution

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10.1006/mpev.2001.1036

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A molecular phylogenetic framework for the phylum Ctenophora using 18S rRNA genes

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