Phylogenetic position of Arctotanais alascensis in the suborder Tanaidomorpha (Peracarida : Tanaidacea)
Phylogenetic position of Arctotanais alascensis in the suborder Tanaidomorpha (Peracarida : Tanaidacea)
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Arctotanais alascensis 在 Tanaidomorpha 亚目（Peracarida : Tanaidacea）中的系统发育位置
DOI：
10.1163/193724011x615406
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发表时间：
2012
影响因子：
1.1
通讯作者：
Hiroshi Kajihara
中科院分区：
文献类型：
--
作者：
Keiichi Kakui;Norio Kobayashi;Hiroshi Kajihara
虽然对Arctotanais alascensis（Richardson，1899）的描述表明了坐骨的存在或不存在，但以前认为在第1-6肢足动物上缺乏坐骨是Tanaoidea超科的一种突触形态。为了解决这一模糊性，我们检查了新收集的A。利用光学和扫描电子显微镜对来自日本北海道的alascensis（包括雄性，以前没有描述过）进行了研究。我们还进行了分子系统发育分析的基础上的18 S rRNA基因的部分序列，以检查A的系统发育位置。alascensis。在这里，我们详细描述了形态的男性ofA。alascensis，这被证明是类似的女性。该物种在第1-6节的腹足上有一个坐骨，这与目前对Tanaoidea和Tanaidae的诊断相矛盾，尽管其他的联会特征仍然有效。分子系统发育分析强烈支持A. alascensisin Tanaoidea，因此，我们修改了Tanaoidea和Tanaidae的诊断，包括在periopods上存在或不存在坐骨。
Lack of an ischium on pereiopods 1-6 was previously considered a synapomorphy for the tanaidacean superfamily Tanaoidea, although descriptions ofArctotanais alascensis(Richardson, 1899), the sole species inArctotanais, indicated presence or absence of the ischium. To resolve this ambiguity, we examined newly collected specimens ofA. alascensis(including males, which had not previously been described) from Hokkaido, Japan, using light and scanning electron microscopy. We also conducted molecular phylogenetic analyses based on partial sequences of the 18S rRNA gene to examine the phylogenetic position ofA. alascensis. Here we describe in detail the morphology of the male ofA. alascensis, which proved to be similar to that of the females. This species bears an ischium on pereiopods 1-6, which contradicts the current diagnoses of Tanaoidea and Tanaidae, although other synapomorphies remain valid. Molecular phylogenetic analyses strongly supported the placement ofA. alascensisin Tanaoidea, and consequently we amended the diagnoses for Tanaoidea and Tanaidae to include either presence or absence of the ischium on the pereiopods.