An integrative phylogenomic approach illuminates the evolutionary history of cockroaches and termites (Blattodea)
An integrative phylogenomic approach illuminates the evolutionary history of cockroaches and termites (Blattodea)
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DOI：
10.1098/rspb.2018.2076
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发表时间：
2019-01-23
影响因子：
4.7
通讯作者：
Simon, Sabrina
中科院分区：
文献类型：
--
作者：
Evangelista, Dominic A.;Wipfler, Benjamin;Simon, Sabrina
蟑螂和白蚁亚群之间的系统发育关系仍然是有争议的问题。它们的分歧时间和进化过程中的主要表型转变也尚未解决。我们解决了这些问题相结合的第一个白蚁和蟑螂的核基因组研究与彻底的方法，分歧时间分析，内共生体的识别，重建祖先的形态特征和行为。Blattodea内的系统发育关系的分析有力地证实了以前不确定的假设，如姐妹组之间的关系Blaberoidea和剩余Blattodea，Lamproblatta是最接近的社会和木材喂养隐尾虫和白蚁。因此，我们提出了新的名称为各个分支Blattodea：隐尾+白蚁= Tutricablattae; Lamproblattidae + Tutricablattae = Kittrickea;和Blattoidea + Corydioidea = Solumblattodea。我们推断的分歧时间与以前的研究相矛盾，表明大多数Blattodea亚群在白垩纪进化，减少分歧时间的分子估计和化石记录之间的差距。在表型水平上，小蠊的地面计划是将卵包直接放置在洞里，而其他形式的产卵，包括卵胎生和胎生，后来出现。最后，蛋护理策略的其他变化可能允许筑巢和其他新奇的适应。
Phylogenetic relationships among subgroups of cockroaches and termites are still matters of debate. Their divergence times and major phenotypic transitions during evolution are also not yet settled. We addressed these points by combining the first nuclear phylogenomic study of termites and cockroaches with a thorough approach to divergence time analysis, identification of endosymbionts, and reconstruction of ancestral morphological traits and behaviour. Analyses of the phylogenetic relationships within Blattodea robustly confirm previously uncertain hypotheses such as the sister-group relationship between Blaberoidea and remaining Blattodea, and Lamproblatta being the closest relative to the social and wood-feeding Cryptocercus and termites. Consequently, we propose new names for various clades in Blattodea: Cryptocercus + termites = Tutricablattae; Lamproblattidae + Tutricablattae = Kittrickea; and Blattoidea + Corydioidea = Solumblattodea. Our inferred divergence times contradict previous studies by showing that most subgroups of Blattodea evolved in the Cretaceous, reducing the gap between molecular estimates of divergence times and the fossil record. On a phenotypic level, the blattodean ground-plan is for egg packages to be laid directly in a hole while other forms of oviposition, including ovovivipary and vivipary, arose later. Finally, other changes in egg care strategy may have allowed for the adaptation of nest building and other novelties.