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xonomy The first known specimen was obtained by W.G. Palmer in 1904 and the next year, Oldfield Thomas of the British Museum of Natural History described this animal as the holotype of a new species he named Nectomys dimidiatus. He placed it in the genus Nectomys, commenting that it was much smaller than but otherwise similar to previously known members of that genus. The species was listed as a Nectomys in taxonomic overviews in the next decades, including a 1944 review of the genus by Philip Hershkovitz. After examining the holotype in London, Hershkovitz instead placed the species in the genus Oryzomys in 1948. He remarked that it was an especially distinctive member of that genus, and hence classified it in its own subgenus Micronectomys. J. Hernández-Camacho described a second species of Micronectomys, Oryzomys (Micronectomys) borreroi, from Colombia in 1957. In 1970, Hershkovitz treated O. dimidiatus in another publication and c onceded that his name Micronectomys was a nomen nudum ("naked name") because he had not explicitly mentioned characters differentiating it from other taxa in his 1948 publication. Nevertheless, he did not do anything to rectify the situation, and Micronectomys remains a nomen nudum. Hershk