Mitochondrial genomes provide insight into interfamilial relationships within Pycnogonida
Mitochondrial genomes provide insight into interfamilial relationships within Pycnogonida
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DOI：
10.1007/s00300-022-03085-6
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发表时间：
2022-09
期刊：
影响因子：
1.7
通讯作者：
J. Zehnpfennig;R. Varney;K. Halanych;A. Mahon
中科院分区：
文献类型：
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作者：
J. Zehnpfennig;R. Varney;K. Halanych;A. Mahon
Pycnogonida，或海蜘蛛，是一个物种分支，有超过1300种描述的物种，在南大洋特别多样化。由于共有的形态特征和高度简化的形式，在11个假定的现存家族之间和内部，海蜘蛛的进化模式仍然没有得到解决。一个公认的家庭的共识的遗传学仍然是有争议的，以前的工作基于各种方法产生了对比的关系假设。为了更好地了解海蜘蛛的主要分支之间的系统发育关系，我们构建了一个数据集的线粒体基因组数据从所有11个目前公认的家庭的代表。在这里，我们发现，线粒体蛋白编码基因的顺序是一致的所有采样的海蜘蛛之间，即使tRNA基因的排列，以及控制区的位置和长度，变化。大的非编码内含子存在于多个家庭表明，密集藻线粒体基因组有一个快速的进化速度。我们的研究结果表明，一个新的，家庭水平的内Pycnogonida，与一个单系分支包含Callipallenidae和Nymphonidae放置为姐妹分支，所有其他公认的家庭。
Pycnogonida, or sea spiders, is a speciose clade with over 1300 described species that is especially diverse in the Southern Ocean. Evolutionary patterns within sea spiders remain unresolved between and within the eleven putative, extant families due to shared morphological traits and highly reduced forms. A consensus phylogeny of recognized families is still debated, and previous work based on various methodologies has produced contrasting hypotheses of relationships. To better understand phylogenetic relationships between major clades of sea spiders, we constructed a dataset of mitochondrial genome data from representatives of all eleven currently recognized families. Herein, we find that the order of mitochondrial protein-coding genes is consistent between all sampled sea spiders, even though arrangement of tRNA genes, as well as placement and length of the control region, varies. The presence of large non-coding introns present in multiple families indicates that pycnogonid mitochondrial genomes have a fast evolutionary rate. Our results suggest a new, familial-level phylogeny within Pycnogonida, with a monophyletic clade containing Callipallenidae and Nymphonidae placed as the sister clade to all other recognized families.