Royal Belgian Institute of Natural Sciences, Rue Vautier 29, 1000 Brussels, Belgium; Laboratory of Marine Biology, Place Croix du Sud 3, Catholic University of Louvain, 1348 Louvain-la-Neuve, Belgium.
Royal Belgian Institute of Natural Sciences, Rue Vautier 29, 1000 Brussels, Belgium.
Mol Phylogenet Evol. 2010 Apr;55(1):202-209. doi: 10.1016/j.ympev.2009.10.025. Epub 2009 Oct 24.
In Antarctic waters, the superfamily Lysianassoidea is one of the most important amphipod groups both in terms of species number and abundance. Dominant members of this superfamily are species of the orchomenid complex, found throughout the Southern Ocean. This study presents the first molecular phylogenetic analysis based on a representative subset of the Antarctic species belonging to different orchomenid genera and hence provides a framework for a systematic revision of these taxa. The current classification of the orchomenid genera is mainly based on mouthpart morphology. The validity of these morphological characters was assessed by resolving phylogenetic relationships using nuclear 28S rRNA and mitochondrial cytochrome oxidase subunit I sequences. The molecular data rejected most of the previously proposed taxonomic subdivisions within this complex. The genera Abyssorchomene and Orchomenella as well as the subgenus Orchomenopsis appeared to be non-monophyletic. This implies that the supposed diagnostic characters are likely a result of convergent evolution. Further, our results indicated the necessity of a revision of the family-level systematics.
在南极水域，lysianassoidea 超科是物种数量和丰度方面最重要的两种桡足类群之一。该超科的优势成员是南极orchomenid 复合体的物种，分布于整个南大洋。本研究首次基于不同 orchomenid 属的南极代表物种进行了分子系统发育分析，为这些分类群的系统修订提供了框架。目前，orchomenid 属的分类主要基于口器形态。通过使用核 28S rRNA 和线粒体细胞色素氧化酶亚基 I 序列解析系统发育关系，评估了这些形态特征的有效性。分子数据否定了该复合体中以前提出的大多数分类细分。abyssorchomene 和 orchomenella 属以及orchomenopsis 亚属似乎不是单系的。这意味着假定的诊断特征可能是趋同进化的结果。此外，我们的结果表明有必要对科级系统发生进行修订。
