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Origin and evolution of the Haustoriidae (Amphipoda): A eulogy for the Haustoriidira
bioRxiv - Zoology Pub Date : 2020-10-25 , DOI: 10.1101/2020.10.24.353664
Zachary B. Hancock , Hiroshi Ogawa , Jessica E. Light , Mary K. Wicksten

Haustoriid amphipods, despite their ubiquity in coastal sand or mud, have received little recent attention and their systematics and phylogenetics are largely unresolved. Some efforts have been made at classifying the family within the broader Amphipoda, but there is persistent incongruence in its placement among different authors and techniques. Furthermore, there exists no phylogenetic hypothesis of intrafamilial relationships despite the potential for rich biogeographic information to be gained given the specific habitat requirements of haustoriids and their limited dispersal abilities. In this work, we evaluate the competing hypotheses on the phylogenetic position of the Haustoriidae within Amphipoda by examining new and previously published sequences of nearly 100 species across 38 families. We find strong support for the Haustoriidae as basal gammarids, and that other families placed within the parvorder Haustoriidira are spread across Amphipoda. The radiation began during the Eocene and may have been driven in North America by the rapid filling of a coastal niche opened by the Chesapeake Bay impact crater. Unlike previous work, we find that the Pacific-endemic genus Eohaustorius is the most basal haustoriid, and that it separated from the rest of the family ~31 Mya. Finally, based on ancestral reconstructions, we provide taxonomic recommendations for relationships within Haustoriidae, including the elevation of a new genus, Cryptohaustorius. We conclude by recommending that the Haustoriidira be abandoned.

中文翻译:

Haustoriidae(Amphipoda)的起源和进化:Haustoriidira的悼词

梭菌类两栖动物尽管在沿海的沙子或泥土中普遍存在,但最近很少受到关注,其系统学和系统发育学在很大程度上尚未得到解决。在将家庭划分为更广泛的两栖动物方面已经做出了一些努力,但是在不同的作者和技术之间,其位置始终存在不一致之处。此外,尽管有详细的栖息地要求,以及抽烟能力有限,但有可能获得丰富的生物地理信息,但没有家族内关系的系统发育假说。在这项工作中,我们通过检查38个科中近100个物种的新序列和先前发表的序列,评估了双翅目中正毛科的系统发育位置的竞争假设。我们发现对虾科的坚强支持是基础的γ-甲线虫,而排列在虾科的虾科中的其他家庭遍布两栖动物。辐射始于始新世,在北美可能是由于切萨皮克湾撞击坑打开的沿海利基的快速填充而驱动的。与以前的工作不同,我们发现太平洋特有的Eohaustorius属是最基础的haustoriid,它与家族其他成员〜31 Mya分开。最后,基于祖先的重建,我们为Haustoriidae内的关系提供了分类学建议,包括新属Cryptohaustorius的升高。最后,我们建议放弃Haustoriidira。辐射始于始新世,在北美可能是由于切萨皮克湾撞击坑打开的沿海利基的快速填充而驱动的。与以前的工作不同,我们发现太平洋特有的Eohaustorius属是最基础的haustoriid,它与家族其他成员〜31 Mya分开。最后,基于祖先的重建,我们为Haustoriidae内的关系提供了分类学建议,包括新属Cryptohaustorius的升高。最后,我们建议放弃Haustoriidira。辐射始于始新世,在北美可能是由于切萨皮克湾撞击坑打开的沿海利基的快速填充而驱动的。与以前的工作不同,我们发现太平洋特有的Eohaustorius属是最基础的haustoriid,它与家族其他成员〜31 Mya分开。最后,基于祖先的重建,我们为Haustoriidae内的关系提供了分类学建议,包括新属Cryptohaustorius的升高。最后,我们建议放弃Haustoriidira。并与其他家人分开〜31妙。最后,基于祖先的重建,我们为Haustoriidae内的关系提供了分类学建议,包括新属Cryptohaustorius的升高。最后,我们建议放弃Haustoriidira。并与其他家人分开〜31妙。最后,基于祖先的重建,我们为Haustoriidae内的关系提供了分类学建议,包括新属Cryptohaustorius的升高。最后,我们建议放弃Haustoriidira。
更新日期:2020-10-27
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