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      Chapter

      Incisor enamel microstructure and systematics in rodents
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      Chapter

      Incisor enamel microstructure and systematics in rodents

      DOI link for Incisor enamel microstructure and systematics in rodents

      Incisor enamel microstructure and systematics in rodents book

      Incisor enamel microstructure and systematics in rodents

      DOI link for Incisor enamel microstructure and systematics in rodents

      Incisor enamel microstructure and systematics in rodents book

      ByThomas Martin
      BookTooth Enamel Microstructure

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      Edition 1st Edition
      First Published 1997
      Imprint CRC Press
      Pages 13
      eBook ISBN 9781003077930
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      ABSTRACT

      Incisor enamel microstructure is a powerful tool for rodent phylogeny and systematics at the familial or higher levels. In rodent incisors three types of Hunter-Schreger bands (HSB) with several subtypes occur. Pauciserial HSB are plesiomorphic within the Rodentia and are derived from somewhat thicker, but structurally very similar primitive mammalian HSB present in early Paleogene eurymylids. Uniserial and multiserial HSB are derived. Multiserial HSB apparently are a synapomorphy of advanced Ctenodactyloidea, Hystricognathi, and Pedetidae. Rodent-like small mammals from the Paleogene of Mongolia with gliriform incisors but lacking HSB in the enamel most probably do not belong to the Rodentia.

      Die Mikrostruktur des Inzisiven-Schmelzes liefert wertvolle Hinweise zur Phylogenie und Systematik höherer Kategorien der Nagetiere. In Nager-Inzisiven treten drei Haupttypen von Hunter-Schreger-Bändern (HSB) mit jeweils mehreren Subtypen auf. Pauciseriale HSB sind innerhalb der Nagetiere plesiomorph und lassen sich von etwas dickeren, strukturell jedoch sehr ähnlichen primitiven HSB, wie sie etwa bei früh-paläogenen Eurymyliden auftreten, ableiten. Multiseriale HSB sind offensichtlich eine Synapomorphie von fortschrittlichen Ctenodactyloidea, Hystricognathi und Pedetidae. Nagerähnliche kleine Säugetiere aus dem Paläogen der Mongolei, die gliriforme Inzisiven ohne HSB besitzen, können mit großer Wahrscheinlichkeit von den Rodentia ausgeschlossen werden.

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