The genus Caenorhabditis has been central to our understanding of metazoan biology. The best-known species, Caenorhabditis elegans, is but one member of a genus with around 50 known species, and knowledge of these species will place the singular example of C. elegans in a rich phylogenetic context. How did the model come to be as it is today, and what are the dynamics of change in the genus? As part of this effort to “put C. elegans in its place”, we here describe the morphology and genome of Caenorhabditis monodelphis sp. n., previously known as Caenorhabditis sp. 1. Like many other Caenorhabditis, C. monodelphis sp. n. has a phoretic association with a transport host, in this case with the fungivorous beetle Cis castaneus. Using genomic data, we place C. monodelphis sp. n. as sister to all other Caenorhabditis for which genome data are available. Using this genome phylogeny, we reconstruct the stemspecies morphological pattern of Caenorhabditis. With the morphological and genomic description of C. monodelphis sp. n., another key species for evolutionary and developmental studies within Caenorhabditis becomes available. The most important characters are its early diverging position, unique morphology for the genus and its similarities with the hypothetical ancestor of Caenorhabditis.

中文翻译：

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单毛孢虫。n .：定义秀丽隐杆线虫的茎形态和基因组学

Caenorhabditis属一直是我们了解后生生物学的中心。最著名的秀丽隐杆线虫只是该属的一个成员，约有50个已知物种，对这些物种的了解将使秀丽隐杆线虫的单一实例具有丰富的系统发育背景。该模型是如何变成今天的样子？类的变化动态是什么？作为“将秀丽隐杆线虫放回原位”这一努力的一部分，我们在这里描述了单毛秀丽隐杆线虫的形态和基因组。n。，原名Caenorhabditis sp。与其他许多秀丽隐杆线虫一样，C。monodelphis sp.。。与运输寄主有幻觉关联，在这种情况下与真菌甲虫Cis castaneus关联。利用基因组数据，我们将C. monodelphis sp。。作为所有其他可获得基因组数据的秀丽隐杆线虫的姐妹。利用这种基因组系统发育，我们重建了秀丽隐杆线虫的茎形态形态模式。与C. monodelphis sp。的形态和基因组描述。n。可以在犬牙根炎内进行进化和发育研究的另一个关键物种。最重要的特征是其早期发散位置，属的独特形态以及与假单胞菌的假设祖先的相似性。