caa a22 4500 47713677X CHVBK 20180405111720.0 cr unu---uuuuu 170330e19971201xx s 000 0 eng 10.1023/A:1027394430433 doi (NATIONALLICENCE)springer-10.1023/A:1027394430433 Dentition and Jaw of Kokopellia juddi , a Primitive Marsupial or Near-Marsupial from the Medial Cretaceous of Utah [Elektronische Daten] [Richard Cifelli, Christian de Muizon] We add to the knowledge of the dentition and lower jaw of the primitive marsupial or near marsupial, Kokopellia juddi, based on newly collected materials from the medial Cretaceous (Albian-Cenomanian) of central Utah. The dental formula, i4 c1 p3 m4, is primitive for (or with respect to) Marsupialia, as are a number of features of the dentary and dentition: presence of a labial mandibular foramen, ?an inflected angle, ?and a trace of the meckelian groove; lack of "staggering” of the lower incisor series; lack of "twinning” between entoconid and hypoconulid on lower molars; incompletely lingual position of lower molar paraconid; upper molar protocone relatively small and mesiodistally narrow; and conules placed about halfway between the protocone and the paracone-metacone. Other than the stylocone, cusps are lacking from the stylar shelf; we argue that this represents the primitive marsupial condition based on the economy of character change and the stratigraphic record of marsupials in the Cretaceous of North America. Recent discoveries of early marsupials, eutherians, and therians of metatherian-eutherian grade provide data indicating that some derived features of the dentary and dentition (e.g., loss of coronoid, meckelian groove, and labial mandibular foramen; acquisition of strong, "winged” conules, double rank postvallum/prevallid shearing, and stylar cusp D) probably arose independently, in some cases more than once, among the major groups of tribosphenic mammals. In turn, this suggests that a common ancestor for marsupials and placentals was more primitive than has generally been appreciated. Plenum Publishing Corporation, 1997 Marsupialia nationallicence dentition nationallicence stylar cusps nationallicence tooth formula nationallicence Cifelli Richard Oklahoma Museum of Natural History and Department of Zoology, University of Oklahoma, 73019, Norman, Oklahoma aut de Muizon Christian URA 12 CNRS, Laboratoire de Paléontologie, Muséum National d'Histoire Naturelle, 8 rue Buffon, 75005, Paris, France aut Journal of Mammalian Evolution Kluwer Academic Publishers-Plenum Publishers 4/4(1997-12-01), 241-258 1064-7554 4:4<241 1997 4 10914 https://doi.org/10.1023/A:1027394430433 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1027394430433 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Cifelli Richard Oklahoma Museum of Natural History and Department of Zoology, University of Oklahoma, 73019, Norman, Oklahoma aut NATIONALLICENCE 700 1- de Muizon Christian URA 12 CNRS, Laboratoire de Paléontologie, Muséum National d'Histoire Naturelle, 8 rue Buffon, 75005, Paris, France aut NATIONALLICENCE 773 0- Journal of Mammalian Evolution Kluwer Academic Publishers-Plenum Publishers 4/4(1997-12-01), 241-258 1064-7554 4:4<241 1997 4 10914 Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 188068724 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer