Recently, Stampar et al. (2019. Linear mitochondrial genome in Anthozoa (Cnidaria): a case study in. Sci Rep. 9(1):6094.) uncovered highly atypical mitochondrial genome structures in the cnidarian species Pachycerianthus magnus and Isarachnanthus nocturnus (Anthozoa, Ceriantharia). These two mitochondrial DNAs assembled as linear fragmented genomes, comprising eight and five chromosomes, respectively—architectures unlike any other anthozoan mitogenome described to date. What’s more, they have cumulative lengths of 77.8 (P. magnus) and 80.9 kb (I. nocturnus), making them the largest animal mitochondrial DNAs on record, a finding which garnered significant attention by various news media. Here, I take a closer look at the work of Stampar et al. and question their key results. I provide evidence that the currently available mitogenome sequences for I. nocturnus and P. magnus, including their structures, sizes, and chromosome numbers, should be treated with caution. More work must be done on these genomes before one can say with any certainty that they are linear, fragmented, or the largest animal mitogenomes observed to date.

中文翻译：

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回顾纤毛（线虫）线粒体基因组：质疑其结构和大小。

最近， Stampar等。（2019. Anthozoa（Cnidaria）中的线性线粒体基因组：Sci Rep。9（1）：6094中的案例研究。）在刺胞物种Pachycerianthus magnus和Isarachnanthus nocturnus（Anthozoa，Ceriantharia）中发现了高度非典型线粒体基因组结构。这两个线粒体DNA组装成线性片段化的基因组，分别包含8条和5条染色体，其结构不同于迄今描述的任何其他花冈有丝分裂基因组。而且，它们的累积长度为77.8（P. magnus）和80.9 kb（I. nocturnus），使它们成为有史以来最大的动物线粒体DNA，这一发现引起了各种新闻媒体的极大关注。在这里，我仔细研究Stampar等人的工作。并质疑他们的主要成果。我提供的证据表明，应谨慎对待夜曲和大假单胞菌目前可用的有丝分裂基因组序列，包括其结构，大小和染色体数。在可以肯定地说它们是线性的，片段化的或迄今为止观察到的最大的动物有丝分裂基因组之前，必须对这些基因组进行更多的工作。