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Paläontologische Zeitschrift

, 64:345 | Cite as

The Schmelzmuster of the Paleogene South American rodentlike marsupialsGroeberia andPatagonia compared to rodents and other Marsupialia

  • Wighart v. Koenigswald
  • Rosendo Pascual
Article

Abstract

The enamel of the lower incisors of two Paleogene South American rodent-like marsupialsGroeberia minoprioi (Groeberiidae) andPatagonia peregrina (Patagoniidae) is described. The fact that the Schmelzmuster lacks Hunter-Schreger bands proves that these genera are basically different from any rodent despite other morphological similarities. Although the enamel is like that of the kangaroo,Macropus rufus, it is not sufficient evidence to include these genera in the Marsupialia. Convergence, based on functional requirements, such as crack stopping mechanisms, is common in the evolution of enamel. Therefore, the Schmelzmuster testifies to the distinctness of the Groeberiidae and Patagoniidae from any rodent; their marsupial nature is based on craniomandibular characters.

Keywords

Late Eocene Lower Incisor Ursinus Enamel Thickness Enamel Structure 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Kurzfassung

Der Schmelz der unteren Schneidezähne vonGroeberia andPatagonia, zweier nagetierartiger Beutler aus Südamerika, wurde untersucht. Das Schmelzmuster ist in beiden Gattungen durch das Fehlen von Hunter-Schreger-Bändern grundsätzlich von Nagetieren unterschieden, ungeachtet der morphologischen ähnlichkeiten der Bezähmungen. Ein ähnliches Schmelzmuster wird zwar für das Kän-guruhMacropus rufus beschrieben, aber diese übereinstimmung allein wäre ein schwaches Argument, die beiden Gattungenzu den Maisupialia zu stellen, weil Konvergenzen bei der Evolution des Zahnschmelzes häufig vorkommen. ähnlichkeiten in den funktionellen Anforderungen, wie eine Bruchsicherung, mögen zu dieser übereinstimmung geführt haben. Damit beweist das Schmelzmuster der Groeberiidae und Patagoniidae den Unterschied gegenüber allen Rodentia. Die Zugehörigkeit zu den Marsupialia belegen Merkmale von Schädel und Kiefer.

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Copyright information

© E. Schweizerbart’sche Verlagsbuchhandlung 1990

Authors and Affiliations

  • Wighart v. Koenigswald
    • 1
  • Rosendo Pascual
    • 2
  1. 1.Institut für PaläontologieUniversität BonnBonnGermany
  2. 2.División Paleontologia VertebradosLa PlataArgentina

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