The rich small-mammal record from the Guadix-Baza Basin (Granada, southern Spain) provides a rather continuous biostratigraphic sequence from the late Miocene to the middle Pleistocene. However, the earliest Pliocene is not so well represented due to the scarcity of levels from this time. In this paper, a complete taxonomic study of the rodent fauna from Botardo-D is presented, providing a more complete information on this poorly known time interval. Representatives of the genera Stephanomys, Paraethomys, Apodemus, Castillomys, Debruijnimys and Apocricetus have been identified. The association indicates an intermediate biostratigraphic position between the levels of Negratín-1 (late Turolian, MN13) and Baza-1 (early Ruscinian, MN14), being now one of the oldest Pliocene sites in the Guadix-Baza Basin. Thereby, Botardo-D enhances our knowledge on the evolution of the rodent community recorded in this basin from the late Miocene to the early Pliocene. A qualitative palaeoecological interpretation suggests the dominance of open grasslands under relatively warm and dry climate conditions in the Guadix-Baza Basin during the deposition of Botardo-D. A tendency towards an increase in humidity from the Messinian Salinity Crisis (latest Miocene) to the Zanclean (early Pliocene) could be shown for southern Iberian Peninsula, supporting previous results.

来自瓜迪克斯-巴扎盆地（西班牙南部格拉纳达）的丰富的小哺乳动物记录提供了从中新世晚期到中更新世的相当连续的生物地层层序。但是，由于此时的水平缺乏，最早的上新世不能很好地代表。在本文中，我们对Botardo-D的啮齿类动物进行了完整的分类学研究，从而提供了有关这一鲜为人知的时间间隔的更完整信息。Stephanomys，Paraethomys，Apodemus，Castillomys，Debruijnimys和Apocricetus属的代表已经确定。关联表明，Negratín-1（MN13晚期的Turolian）和Baza-1（MN14早期的Ruscinian）之间处于中间生物地层位置，现在是Guadix-Baza盆地最古老的上新世遗址之一。因此，Botardo-D增强了我们对该盆地从中新世晚期到上新世早期记录的啮齿动物群落演化的认识。定性的古生态解释表明，在Bodardo-D沉积过程中，瓜迪克斯-巴扎盆地在相对温暖干燥的气候条件下，开放草原占主导地位。伊比利亚半岛南部可能显示出从墨西尼盐度危机（最新中新世）到赞克拉（上新世早期）的湿度增加趋势，这支持了先前的结果。