Molecular Evidence Suggesting Species in the Zoanthid Genera Palythoa and Protopalythoa (Anthozoa: Hexacorallia) Are Congeneric(Taxonomy)
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概要
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Taxonomic status of the zoanthid genera Palythoa and Protopalythoa has been in question for almost a century. Separation of the two genera has been based on traditional morphological methods (colony and polyp form, nematocyst size and form, and number of septa), with Palythoa polyps embedded in a well developed coenenchyme and Protopalythoa polyps standing free and clear of the coenenchyme. Here we sequenced two mitochondrial regions, the cytochrome oxidase I (COI) gene and 16S ribosomal DNA (16S rDNA) genes, from Palythoa and Protopalythoa samples from various parts of the world and performed phylogenetic analyses of the sequence data. The phylogenetic trees for both COI and 16S rDNA from Palythoa and Protopalythoa show four monophyletic groups (designated Palythoa tuberculosa, Palythoa heliodiscus, Palythoa mutuki 1, and Palythoa mutuki 2), with levels of sequence divergence (COI and 16S rDNA divergence approximately 0.0〜1.1%) similar to or lower than that previously found among congeneric species within the closely related genus Zoanthus. Surprisingly, sequence differences among Palythoa tuberculosa, Palythoa mutuki 1, and Palythoa mutuki 2 were negligible (0.0〜0.2% for both COI and 16S rDNA), potentially indicating relationships below the species level. Our sequences align well with the few Palythoa and Protopalythoa sequences reported to date. These findings strongly indicate that our samples represent a minimum of two and possibly up to four species (the Palythoa tuberculosa - P. mutuki 1 - P. mutuki 2 group, and P. heliodiscus) within the genus Palythoa, and that the genus Protopalythoa is erroneous nomenclature.
- 社団法人日本動物学会の論文
- 2006-01-25
著者
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Reimer J
Research Program For Marine Biology And Ecology Extremobiosphere Research Center Japan Agency For Ma
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REIMER James
Research Program for Marine Biology and Ecology, Extremobiosphere Research Center, Japan Agency for
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ONO Shusuke
Miyakonojo Higashi High School
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TSUKAHARA Junzo
Department of Developmental Biology, Faculty of Science, Kagoshima University
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TAKISHITA Kiyotaka
Research Program for Marine Biology and Ecology, Extremobiosphere Research Center, Japan Agency for
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MARUYAMA Tadashi
Research Program for Marine Biology and Ecology, Extremobiosphere Research Center, Japan Agency for
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Maruyama Tadashi
Research Program For Marine Biology And Ecology Extremobiosphere Research Center Japan Agency For Ma
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Maruyama Tadashi
Marine Biotechnology Institute Co. Ltd:(present Address) Japan Marine Science & Technology Cente
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Maruyama Tadashi
Research Laboratory For Nuclear Reactors Tokyo Institute Of Technology
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Takishita Kiyotaka
Research Program For Marine Biology And Ecology Extremobiosphere Research Center Japan Agency For Ma
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Tsukahara J
Department Of Developmental Biology Faculty Of Science Kagoshima University
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Tsukahara Junzo
Department Of Chemistry And Bioscience Faculty Of Science Kagoshima University
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Reimer James
Research Program for Marine Biology and Ecology, Extremobiosphere Research Center, Japan Agency for Marine-Earth Science and Technology
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