Ultraconserved elements-based phylogenomic systematics of the snake superfamily Elapoidea, with the description of a new Afro-Asian family
Ultraconserved elements-based phylogenomic systematics of the snake superfamily Elapoidea, with the description of a new Afro-Asian family
复制标题
DOI：
10.1016/j.ympev.2022.107700
复制
发表时间：
2023-01-06
影响因子：
4.1
通讯作者：
Merila, Juha
中科院分区：
文献类型：
--
作者：
Das, Sunandan;Greenbaum, Eli;Merila, Juha
高度多样化的蛇总科Elapoidea被认为是古代快速辐射的典型例子。这种辐射很难从系统发育上完全解决，高度多样化的Elapoidea就是一个例子。以前推断长方体系统发育的尝试对它们的进化关系产生了高度不一致的估计，而且通常具有非常低的统计支持。我们试图通过对来自每个长形科/亚科级分类单元的多个代表的 4,500 多个超保守元件位点进行测序，并使用多种方法推断它们的系统发育关系来解决这一问题。基于串联和多物种合并的物种树产生了基本上一致且得到良好支持的拓扑。对于任何深分支，不保留硬多切术的假设。我们的系统发育恢复了环蝽科和眼镜蛇科，因为它们在眼镜蛇总科中很早就出现了分歧。非洲-马达加斯加辐射的蛇类蛇被一些早期作者归类为包容性蛇科的多个亚科，在所有分析中都发现它们是单系的。 Micrelaps 属一直被发现是 Lamprophiidae 的姐妹。我们建立了一个新科，Micrelapidae 科。 11 月，对于 Micrelaps 并根据颅骨骨学同源性将 Brachyophis 分配给这个家族。我们估计，Elapoidea 起源于始新世早期，并在这个时代迅速多样化为所有主要谱系。白垩纪后-古近纪大规模灭绝事件带来的生态机会可能促进了蛇类的爆炸性辐射。
The highly diverse snake superfamily Elapoidea is considered to be a classic example of ancient, rapid radiation. Such radiations are challenging to fully resolve phylogenetically, with the highly diverse Elapoidea a case in point. Previous attempts at inferring a phylogeny of elapoids produced highly incongruent estimates of their evolutionary relationships, often with very low statistical support. We sought to resolve this situation by sequencing over 4,500 ultraconserved element loci from multiple representatives of every elapoid family/sub-family level taxon and inferring their phylogenetic relationships with multiple methods. Concatenation and multispecies coalescent based species trees yielded largely congruent and well-supported topologies. Hypotheses of a hard polytomy were not retained for any deep branches. Our phylogenies recovered Cyclocoridae and Elapidae as diverging early within Elapoidea. The Afro-Malagasy radiation of elapoid snakes, classified as multiple subfamilies of an inclusive Lamprophiidae by some earlier authors, was found to be monophyletic in all analyses. The genus Micrelaps was consistently recovered as sister to Lamprophiidae. We establish a new family, Micrelapidae fam. nov., for Micrelaps and assign Brachyophis to this family based on cranial osteological syn-apomorphy. We estimate that Elapoidea originated in the early Eocene and rapidly diversified into all the major lineages during this epoch. Ecological opportunities presented by the post-Cretaceous-Paleogene mass extinction event may have promoted the explosive radiation of elapoid snakes.