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Phylogenetic analysis of Dendronotus nudibranchs with emphasis on northeastern Pacific species

机译：东北太平洋物种的树突齿科的系统发育分析

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摘要

Molecular and morphological evidence suggests that the taxonomic status of several eastern Pacific species of Dendronotus needs a reassessment. Dendronotus diversicolor and D. albus are synonymized due to lack of genetic variation in the 16S rRNA gene and of any significant morphological differences. Dendronotus nanus and D. iris are also regarded as synonyms based on a reevaluation of ecological and morphological data. Finally, the name D. venustus is resurrected for eastern Pacific populations previously considered to be D. frondosus. Pacific D. venustus display consistent morphological and molecular differences from Atlantic D. frondosus. The molecular phylogeny presented here is not robust enough to shed light on the evolution and biogeography of Dendronotus, but preliminary evidence indicates that the Pacific species of Dendronotus are not a monophyletic group, because Arctic and Atlantic species are nested within them. The 16S rRNA genetic diversity within Dendronotus is very small compared to that of other related groups. These data, along with the comparatively large diversity of Dendronotus in the Pacific, suggest the possibility that relatively recent Arctic migration and vicariance along Beringia may have been involved in the evolution of this group.
机译：分子和形态学证据表明，需要重新评估东太平洋几种树突龙的生物分类状况。由于缺乏16S rRNA基因的遗传变异和任何明显的形态学差异，Dendronotus diversicolor和D. albus成为同义词。根据对生态学和形态学数据的重新评估，Dendronotus nanus和D. iris也被视为同义词。最后，对于以前被认为是D. frondosus的东太平洋人口，D。venustus被重新使用。太平洋D. venustus与大西洋D. frondosus显示出一致的形态和分子差异。此处介绍的分子系统发育还不足以阐明Dendronotus的进化和生物地理学，但是初步证据表明Dendronotus的太平洋物种不是单系物种，因为北极和大西洋物种嵌套在其中。与其他相关群体相比，树突龙内的16S rRNA遗传多样性非常小。这些数据，再加上太平洋地区的Dendronotus种类繁多，表明该类群的演化可能涉及相对较近期的北极迁徙和沿白令的迁徙。

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    《Journal of Molluscan Studies》 |2010年第4期|p.367-375|共9页
  • 作者

    Carla C. Stout; Marta Pola;

  • 作者单位

    Biological Sciences Department, California State Polytechnic University, Pomona, 3801 W. Temple Avenue, Pomona, CA 91768, USA;

    California Academy of Sciences, 55 Music Concourse Dr., Golden Gate Park, San Francisco, CA 94118, USA;

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