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首页> 外文期刊>Journal of Systematic Palaeontology >A new Pleistocene Ctenomys and divergence dating of the hyperdiverse South American rodent family Ctenomyidae
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A new Pleistocene Ctenomys and divergence dating of the hyperdiverse South American rodent family Ctenomyidae

机译：一个新的更新世塞鼻森斯和利差约会的超凡植物南美啮齿动物家族Ctenomyidae

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摘要

The South American Ctenomys is the most speciose genus among both hystricomorphs and subterranean rodents of the world. Here, we present the most exhaustive phylogenies and timetree of living and extinct Ctenomys attempted thus far. We describe Ctenomys rusconii sp. nov., a small-sized species from the upper Early Pleistocene of central Argentina. We analyse its cranial and mandibular shape as well as its phylogenetic position in the context of other extinct Ctenomys and a wide sample of living species. A parsimony analysis shows that Ctenomys rusconii sp. nov. integrates the stem group of Ctenomys together with late Pliocene to Middle Pleistocene species, while the crown group comprises only Middle Pleistocene to recent representatives. Within the crown Ctenomys, nine well-supported major clades were recovered, eight of which are consistent with previously recognized extant species groups. A Bayesian tip-dating analysis provided divergence age estimates of 3.8 Ma and 1.3 Ma for the origin of the genus and the crown clade, respectively. Remarkably, the extinct species recovered as members of the crown clade, i.e. C. dasseni, C. kraglievichi, C. subassentiens and C. viarapaensis, were clustered into the earliest diverging clade corresponding to the frater species group. Age estimates for the divergence of the crown and its major clades are markedly younger than what has been generally considered so far, which implies a new view on the timing of taxonomic, ecological and geographical diversification of the genus. Even considering that this interpretation is affected by biases inherent to the fossil record, the phylogenetic delimitation of the crown clade as restricted to species recorded since the Middle Pleistocene seems to configure a pattern underlain by a fast and late cladogenesis.
机译：南美洲CTENOMYS是世界上最具特色的属植物和世界上的地下啮齿动物。在这里，我们展示了最令人遗憾的文学和迄今为止未遂的生物和灭绝的肠道。我们描述了Ctenomys Rusconii SP。 11月。，来自阿根廷中部早期优秀先生的小型物种。我们分析其颅骨和下颌形状以及其在其他灭绝的Ctenomys和广泛的生活样本的背景下的系统发育地位。关于CTENOMYS RUSCONII SP的分析分析表明。 11月。将CTENOMYS的茎组与后期全胞外酯与中冬烯物种整合，而皇冠基团仅包含最近的互联网代表。在皇冠Ctenomys内，回收了九种良好的主要曲线，其中八个与先前识别的外延物种组一致。贝叶斯尖端分析分别为属的起源和皇冠分别的起源提供了3.8 mA和1.3 mA的发散年龄估计。值得注意的是，作为皇冠分支成员的灭绝物种，即C. dasseni，C.Kraglievichi，C.亚替代菌和C.Viarapaensis被聚集成与Frats物种组相对应的最早发散的疏水性。年龄估计冠军及其主要林业的估计比到目前为止的一般认为，这意味着关于对属性分类，生态和地理多样化的时序的新观点。甚至考虑到这种解释受到化石记录固有的偏见的影响，冠部门的系统发育限制为因中间级联似乎在中间级肾上腺似乎通过快速和晚期封闭构建底层的模式而受到限制。

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  • 来源
    《Journal of Systematic Palaeontology》 |2021年第6期|377-392|共16页
  • 作者

    De Santi Nahuel A.; Verzi Diego H.; Olivares A. Itati; Pinero Pedro; Alvarez Alicia; Morgan Cecilia C.;

  • 作者单位

    Univ Nacl La Plata CONICET Secc Mastozool Museo La Plata Fac Ciencias Nat & Museo La Plata Buenos Aires Argentina;

    Univ Nacl La Plata CONICET Secc Mastozool Museo La Plata Fac Ciencias Nat & Museo La Plata Buenos Aires Argentina;

    Univ Nacl La Plata CONICET Secc Mastozool Museo La Plata Fac Ciencias Nat & Museo La Plata Buenos Aires Argentina;

    Univ Nacl La Plata CONICET Secc Mastozool Museo La Plata Fac Ciencias Nat & Museo La Plata Buenos Aires Argentina;

    UNJu CONICET IdGyM Inst Ecorreg Andinas INECOA Av Bolivia 1661 Y4600GNE San Salvador de Jujuy San Salvador De Jujuy Argentina;

    Univ Nacl La Plata CONICET Secc Mastozool Museo La Plata Fac Ciencias Nat & Museo La Plata Buenos Aires Argentina;

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  • 关键词

    Ctenomyidae; South America; Pleistocene; phylogeny; timetree;

    机译：ctenomyidae;南美洲;全新生;文学;timetree;

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