Historical diversification of <i>Pseudonympha</i> Wallengren, 1857 (Lepidoptera: Nymphalidae: Satyrinae)

The butterfly genus <i>Pseudonympha</i> and several related genera are endemic to southern Africa. Although many of the species are montane, some inhabit the arid interior of South Africa, offering an opportunity to study the palaeobiogeography of this biome. Morphological data (for all species of <i>Pseudonympha</i> and allied African and Asian genera) and molecular data (<i>WG</i> and COI genes for nine of the 15 species of <i>Pseudonympha</i> and all of the southern African endemic genera of Ypthimina) were compiled. Phylogenetic analysis indicated that <i>Pseudonympha</i> apparently originated in the Cape Fold Mountains about 15 Mya ago and spread steadily eastwards and northwards along the Great Escarpment during the aridification of the region, perhaps assisted by orogeny in the east and oceanic cooling in the west. Aridification cycles seem to have intermittently isolated some early lineages in elevated habitats in the interior, so that those lineages show lower speciation rates (or perhaps higher extinction rates) than those in the east. Four species delineation techniques indicated that some species are taxonomically oversplit. Based on genetic polyphyly and morphological similarity, we propose that the status of <i>P. swanepoeli</i> be reduced to that of a subspecies of <i>P. varii</i>, such that all the north-eastern populations from Harrismith to Tzaneen fall under <i>P. varii swanepoeli</i> van Son <b>stat. n</b>., and all the southern populations fall under <i>P. varii varii</i> van Son <b>stat. n</b>. Ultimately, the diversification of both of these lineages seems tied to their host plants’ response to aridification brought on by continental drift and orogeny. Sympatric organisms (eg cicadas) with biologies focused around different resources (eg savanna trees) show other patterns of diversification. The phylogenetic analysis of the subtribe Ypthimina also supports the monophyly of <i>Paternympha</i>, paraphyly of <i>Ypthima</i>, recognition of <i>Thymipa</i> Moore stat. rev. as a phylogenetic independent genus, and new relationships for <i>Strabena</i>. http://www.zoobank.org/urn:lsid:zoobank.org:pub:C3B34CBC-4BC2-44F3-8349-9DBC82FFBBF3假眼蝶属（Pseudonympha）及若干近缘蝴蝶属为南非南部特有类群。尽管多数物种为山地栖息型，部分类群却栖息于南非内陆干旱区域，为该生物群系的古生物地理学研究提供了绝佳契机。研究人员整合了形态学数据（涵盖假眼蝶属全部物种，以及非洲、亚洲的近缘属类群）与分子数据：针对假眼蝶属15个物种中的9个，以及珂眼蝶亚族（Ypthimina）所有南非特有属，获取了WG基因与COI基因的序列信息。系统发育分析结果显示，假眼蝶属约于1500万年前起源于开普褶皱山脉（Cape Fold Mountains），并在该区域干旱化进程中沿大陡崖（Great Escarpment）持续向东、向北扩散，这一扩散过程或得益于东部的造山运动与西部的海洋降温事件。干旱化周期似乎间歇性地将部分早期支系隔离在内陆的高海拔生境中，使得这些支系的物种形成速率低于东部支系（或灭绝速率更高）。四种物种界定方法均表明，部分类群存在分类学上的过拆分现象。基于系统发育复系性与形态相似性，本研究提议将P. swanepoeli降级为P. varii的亚种：原分布于哈里史密斯（Harrismith）至察嫩（Tzaneen）的东北种群归为P. varii swanepoeli van Son stat. n.，南部种群则归为P. varii varii van Son stat. n.。最终，这两个支系的多样化过程似乎与其寄主植物响应大陆漂移与造山运动引发的干旱化过程紧密相关。以不同资源（如稀树草原树木）为生存核心的同域分布生物（如蝉类）则呈现出其他的多样化模式。对珂眼蝶亚族的系统发育分析同时支持了Paternympha的单系性、Ypthima的并系性，将Thymipa Moore stat. rev.恢复为独立的系统发育属，并明确了Strabena的全新系统发育关系。http://www.zoobank.org/urn:lsid:zoobank.org:pub:C3B34CBC-4BC2-44F3-8349-9DBC82FFBBF3

搜集汇总

背景与挑战

背景概述

该数据集聚焦于南非特有蝴蝶属Pseudonympha的历史多样化研究，结合形态学和分子数据（WG和COI基因）分析其起源和扩散。研究发现该属约1500万年前起源于Cape Fold Mountains，并随区域干旱化沿Great Escarpment扩散，同时提出了物种分类的调整建议，如将P. swanepoeli降级为P. varii的亚种。数据集支持对古生物地理学和进化模式的理解。