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<p>A recently discovered multituberculate skull with a nearly complete dentition from the lower Paleocene part of the Denver Formation (Corral Bluffs study area, Denver Basin, Colorado) represents a species of taeniolabidid that is smaller than <i>Taeniolabis taoensis</i>. We conclude that this skull, as well as an isolated upper first molar from the same study area, pertains to <i>Kimbetopsalis simmonsae</i>, previously known only from the Nacimiento Formation of the San Juan Basin, New Mexico. The Corral Bluffs skull includes the first lower jaw and lower dentition for the species. Based on our assessment of intraspecific variation in a large sample of <i>T. taoensis</i> from the Nacimiento Formation, we reevaluated all occurrences of <i>Taeniolabis</i> in the Western Interior of North America. We consider <i>Kimbetopsalis</i> a subjective junior synonym of <i>Taeniolabis</i> and therefore refer the species to <i>Taeniolabis</i> in a new combination, <i>Taeniolabis simmonsae</i>. Questions remain as to whether <i>T. simmonsae</i> is morphologically distinct from <i>T. lamberti</i> (Fort Union Formation, Montana). In-situ occurrences of <i>T. simmonsae</i> are lower than those of <i>T. taoensis</i> in the Corral Bluffs stratigraphic section and are in association with those of mammals characteristic of the <i>Ectoconus</i>/<i>Taeniolabis taoensis</i> Interval Zone (Pu2) of the Puercan North American Land Mammal Age, and earlier than those of mammals that characterize the <i>Taeniolabis taoensis/Periptychus carinidens</i> Interval Zone (Pu3). Thus, <i>Taeniolabis</i>, considered by some authors to be restricted to the Pu3 Interval Zone, occurs in both Pu2 and Pu3 zones, which has profound implications for early Paleocene bio- and geochronology.</p>

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Taeniolabis simmonsae (Multituberculata, Taeniolabididae) from the early Paleocene of the Denver Basin, Colorado: implications for taeniolabidid taxonomy and biochronology of the Puercan North American Land Mammal Age

  • 期刊论文

  • 发表日期：

    2026年5月27日

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  • David W. Krause,
  • Lucas N. Weaver,
  • Stephen G. B. Chester,
  • Craig S. Scott,
  • Ken Weissenburger,
  • Jordan W. Crowell,
  • Rudolph R. Hummel,
  • Tyler R. Lyson

摘要

A recently discovered multituberculate skull with a nearly complete dentition from the lower Paleocene part of the Denver Formation (Corral Bluffs study area, Denver Basin, Colorado) represents a species of taeniolabidid that is smaller than Taeniolabis taoensis. We conclude that this skull, as well as an isolated upper first molar from the same study area, pertains to Kimbetopsalis simmonsae, previously known only from the Nacimiento Formation of the San Juan Basin, New Mexico. The Corral Bluffs skull includes the first lower jaw and lower dentition for the species. Based on our assessment of intraspecific variation in a large sample of T. taoensis from the Nacimiento Formation, we reevaluated all occurrences of Taeniolabis in the Western Interior of North America. We consider Kimbetopsalis a subjective junior synonym of Taeniolabis and therefore refer the species to Taeniolabis in a new combination, Taeniolabis simmonsae. Questions remain as to whether T. simmonsae is morphologically distinct from T. lamberti (Fort Union Formation, Montana). In-situ occurrences of T. simmonsae are lower than those of T. taoensis in the Corral Bluffs stratigraphic section and are in association with those of mammals characteristic of the Ectoconus/Taeniolabis taoensis Interval Zone (Pu2) of the Puercan North American Land Mammal Age, and earlier than those of mammals that characterize the Taeniolabis taoensis/Periptychus carinidens Interval Zone (Pu3). Thus, Taeniolabis, considered by some authors to be restricted to the Pu3 Interval Zone, occurs in both Pu2 and Pu3 zones, which has profound implications for early Paleocene bio- and geochronology.