Mueller (2007) noted that the name Buettneria Case 1922, for the large Late Triassic metoposaurid from the United States, was preoccupied, and recommended the next available name Koskinonodon Branson and Mehl 1929 as the replacement name for this taxon.
Subsequently Lucas et al. (2007) petitioned the International Committee of Zoological Nomenclature (ICZN) to conserve this name. Details of the case and comments are available here (click expand on Case 3420). The final opinion can be found here.
Mueller, B. D. 2006. Koskinonodon Branson and Mehl, 1929, a replacement name for the preoccupied temnospondyl Buettneria Case, 1922. Journal of Vertebrate Paleontology 27:225.
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