A new Puercan (early Paleocene) hyopsodontid "condylarth" from New Mexico

Thomas E. Williamson, Anne Weil

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4 Scopus citations


Isolated cheek teeth from the late Puercan (early Paleocene) Split Lip Flats local fauna, from the head of Willow Wash, Nacimiento Formation, San Juan Basin, represent a new genus and species of hyopsodontid "condylarth", Chacomylus sladei. The teeth are small, bunodont, and are remarkable for the enlargement of the protocone, pronounced exodaenodonty, and high degree of attritional wear caused by transverse shearing or grinding. Although C. sladei bears a superficial resemblance to the apheliscine apheliscid Gingerichia, a preliminary phylogenetic analysis confirms that it is a hyopsodontid, closely related to the Puercan hyopsodontids Valenia wilsoni and Litomylus orthronepius.

Original languageEnglish
Pages (from-to)247-255
Number of pages9
JournalActa Palaeontologica Polonica
Issue number2
StatePublished - Jun 2011


  • Condylartha
  • Hyopsodontidae
  • Mammalia
  • Nacimiento Formation
  • New Mexico
  • Paleocene
  • Puercan


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