Abstract

During a faunal survey in the foothills of the Ecuadoran Andes southwest of the Cordillera del Cóndor, a mouse of uncertain affinities was taken in a fishing net. Various external characters suggested that it was a member of the genus Rhagomys, previously unrecorded in Ecuador. Comparisons with the external, cranial, and dental morphology both of Rhagomys rufescens and R. longilingua identified a number of unique characters, including its long, narrow rostrum and incisive foramina and the reduced anterolingual conule on its M1 procingulum. We describe the mouse as a new species of Rhagomys; both its morphology and molecular analyses suggest that it is sister to R. longilingua. This record of Rhagomys in southern Ecuador extends the known distribution of the genus 700 km northward and adds yet another genus and species to Ecuador’s extensive list of rodent species.

中文翻译：

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厄瓜多尔东南部的一种新的鼠李属（Ragogomys）（Rodentia，Sigmodontinae）

摘要

在科尔迪勒拉·德尔·科多尔西南厄瓜多尔安第斯山脉山脚下进行的动物区系调查中，在捕鱼网中捕获了一只亲和力不确定的老鼠。各种各样的外部字符表明它是Rhagomys属的成员，该类以前在厄瓜多尔未记录。与Rhagomys rufescens和R. longilingua的外部，颅骨和牙齿形态进行比较，发现了许多独特的特征，包括其长长的，狭窄的讲台和尖锐的孔洞，以及其M1程序上的前耳后突减少。我们将老鼠描述为Rhagomys的一种新物种; 它的形态和分子分析均表明它是R. longilingua的姐妹。此记录厄瓜多尔南部的Rhogomys将已知属的分布向北扩展了700公里，并为厄瓜多尔的大量啮齿动物物种增加了另一个属和种。