The subfamily Dolichotinae (Rodentia, Caviidae) includes two living species (Dolichotis patagonum and D. salinicola) of cursorial, long-legged rodents that inhabit semiarid thorn scrubs and shrublands in southern South America. Some authors consider that the morphological differences between D. patagonum and D. salinicola warrant circumscription of the latter in its own genus, Pediolagus. Based on a phylogeny and divergence times grounded on molecular data, as well as a qualitative and quantitative assessment of morphological differences, the distinction between Dolichotis and Pediolagus is equal to or greater than differences seen for other intergeneric comparisons within Cavioidea. Based on these results, we argue that the taxonomic designations of Dolichotis and Pediolagus should be retained.

中文翻译：

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现存 maras 的综合分类支持在 Dolichotinae（啮齿目，Caviidae）中识别 Pediolagus 和 Dolichotis 属

Dolichotinae 亚科（Rodentia、Caviidae）包括两种生活在南美洲南部半干旱刺灌木和灌木丛中的游动长腿啮齿动物（Dolichotis patagonum 和 D. salinicola）。一些作者认为 D. patagonum 和 D. salinicola 之间的形态差异保证了后者在其自己的属 Pediolagus 中的界限。基于基于分子数据的系统发育和分化时间，以及对形态差异的定性和定量评估，Dolichotis 和 Pediolagus 之间的区别等于或大于 Cavioidea 内其他属间比较的差异。基于这些结果，我们认为应该保留 Dolichotis 和 Pediolagus 的分类名称。