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Molecular evidence for multiple lineages in the gorgonian family Plexauridae (Anthozoa: Octocorallia)

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Abstract

Octocorals are diverse and abundant on many marine hard substrates, and, within this group, members of the family Plexauridae are an important component of tropical reef assemblages, especially in the Caribbean. To understand historical relationships within this large and diverse assemblage, and to test the monophyly of the family and some of its genera, DNA sequences of two mitochondrial loci (msh1 and ND2, ~1,185 bp) were analyzed from 46 species in 21 genera from deep and shallow waters in the tropical western Atlantic and in the tropical western and eastern Pacific (plus 9 taxa in the closely related Gorgoniidae and 1 species of the more distantly related Alcyoniidae). Five strongly supported clades were recovered. Three large clades correspond roughly to the Plexauridae, Paramuriceidae, and Gorgoniidae, and two smaller clades were comprised of taxa previously assigned to several families. Astrogorgia sp. did not group with any of the clades. The mutual relationships among the five clades remain unclear. Several genera previously regarded as unrelated appear to be grouped among the three “families”; e.g. Hypnogorgia sp. (Paramuriceidae) falls within a clade consisting of both Pacific and Atlantic Muricea spp. (Plexauridae), while Swiftia sp., Scleracis sp., and an Atlantic Thesea sp. (all Paramuriceidae) group with the gorgoniids. In several instances, genera containing Atlantic and Pacific species were recovered as monophyletic (Muricea spp., Bebryce spp.). However, in at least three cases (Echinomuricea spp., Thesea spp., Villogorgia spp.), placement of Atlantic and Pacific species in the same genus may reflect convergence of sclerite morphology. The results indicate a strong need for reexamination of octocoral taxonomy using a combination of molecular, morphological, and chemical evidence.

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Acknowledgements

This study was supported by funds from the National Oceanic and Atmospheric Administration Coastal Ocean Program (NA16OA2413) to the National Coral Reef Institute (NCRI), and by the Guy Harvey Research Institute, Nova Southeastern University. We thank M. Dore for assisting with SEM images and G. Williams (California Academy of Sciences) and G. Rouse (South Australian Museum, Adelaide) for their generous contributions of Pacific plexaurid and paramuriceid samples. This research complied with all laws of the United States of America.

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Author notes

  1. C. J. Douady

    Present address: Equipe Hydrobiologie et Ecologie Souterraines, UMR 5023—Ecologie des Hydrosystèmes, Fluviaux, Bât. Forel (403)—La Doua, Université Lyon I, 43, Bd du 11-11-1918, 69622, Lyon, Villeurbanne Cedex, France

Authors and Affiliations

  1. National Coral Reef Institute, Oceanographic Center, Nova Southeastern University, 8000 North Ocean Drive, Dania Beach, FL, 33004, USA

    H. H. Wirshing, C. G. Messing & M. S. Shivji

  2. Department of Biochemistry and Molecular Biology, Dalhousie University, 5859 University Ave., Halifax, NS, B3H 4H7, Canada

    C. J. Douady

  3. Division of Biomedical Marine Research, Harbor Branch Oceanographic Institution, 5600 U.S. 1 North, Fort Pierce, FL, 34946, USA

    J. Reed

  4. Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY, 14853, USA

    M. J. Stanhope

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  1. H. H. Wirshing
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  6. M. S. Shivji
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Correspondence to M. S. Shivji.

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Communicated by J.P. Grassle, New Brunswick

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Wirshing, H.H., Messing, C.G., Douady, C.J. et al. Molecular evidence for multiple lineages in the gorgonian family Plexauridae (Anthozoa: Octocorallia). Marine Biology 147, 497–508 (2005). https://doi.org/10.1007/s00227-005-1592-y

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