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Paläontologische Zeitschrift

, Volume 88, Issue 4, pp 481–494 | Cite as

First evidence of the tooth eruption sequence of the upper jaw in Hyaenodon (Hyaenodontidae, Mammalia) and new information on the ontogenetic development of its dentition

  • Katharina BastlEmail author
  • Doris Nagel
Research Paper

Abstract

Juvenile material with the main focus on the upper jaw of the fossil predator Hyaenodon was evaluated to study the tooth eruption sequence and to examine the ontogeny of its dentition in detail. The comparison in size of milk to permanent teeth indicates a growth rate of 12–16 % in Hyaenodon. The thin section of a deciduous canine of a North American taxon shows four dental rings. Based on the knowledge of recent carnivores, this implies an age of 3–4 years in the last stage of tooth eruption and thus a long juvenile phase. The mandibles ascertained the most recent established tooth eruption sequence for North American and European species. For the first time ever, juvenile material from Asia is documented and interpreted. This study likewise shows a difference in the sequence of the upper jaw: the first upper premolar erupts before the first upper molar in North American species, whereas the European taxa show an earlier eruption of the first upper molar. This fact further confirms the divergence between the Hyaenodon lineages from North America and Europe.

Keywords

Hyaenodon Tooth eruption sequence Growth rates Dental rings Oligocene Mammalia 

Abbreviations

AMNH

American Museum of Natural History (New York, USA)

NHMUK

British Museum of Natural History (London, UK)

BSPG

Bayerische Staatssammlung für Geologie und Paläontologie (München, Germany)

F:AM

Frick Collection at the American Museum of Natural History (New York, USA)

GMM

Geomuseum, Westfälische Wilhelms-Universität (Münster, Germany)

IUPW

Paläontologisches Institut, Universität Wien (Wien, Austria)

MNHN

Muséum National d′Histoire Naturelle (Paris, France)

MNHN Au

Aubrelong collection at the MNHN

MNHN PD

Pech Desse collection at the MNHN

MNHN Qu

Quercy collection at the MNHN

NHMW

Fossil Vertebrate Collection, Naturhistorisches Museum Wien (Vienna, Austria)

YPM-PU

Princeton Collection moved to Yale Peabody Museum (New Haven, USA)

C

Upper canine

c

Lower canine

D

Upper deciduous/milk tooth

d

Lower deciduous/milk tooth

I

Upper incisive

i

Lower incisive

M

Upper molar

m

Lower molar

P

Upper premolar

p

Lower premolar

Kurzfassung

Juveniles Material des fossilen Räubers Hyaenodon wurde hinsichtlich des Zahnwechsels im Oberkiefer im Speziellen, der Sequenz des Zahnwechsels im Allgemeinen und der Ontogenie der Bezahnung untersucht. Der Vergleich von Milch- zu Dauerzähnen deutet auf eine Wachstumsrate von 12–16 % bei Hyaenodon hin. Der Dünnschliff eines Milcheckzahnes einer nordamerikanischen Art zeigt 4 Dentinringe. Basierend auf der Kenntnis bei rezenten Raubtieren, ist das Alter des Individuums auf drei bis vier Jahre zu interpretieren. Da es sich im letzten Stadium des Zahnwechsels noch befunden hat, wird eine lange juvenile Phase impliziert. Die Unterkiefer bestätigen die vor kurzem aufgestellte Zahnwechselfolge bei nordamerikanischen und europäischen Arten. Zum ersten Mal kann auch juveniles Material aus Asien vorgestellt und gedeutet werden. Diese Studie dokumentiert auch einen Unterschied im Verlauf des Zahnwechsels im Oberkiefer: der erste, obere Prämolar bricht vor dem ersten Molar in nordamerikanischen Arten durch, im Gegensatz dazu zeigen europäische Formen einen früheren Durchbruch des ersten, oberen Molaren. Diese Beobachtung bestätigt die Divergenz zwischen den Hyaenodon-Linien von Nordamerika und Europa.

Schlüsselwörter

Hyaenodon Zahnwechsel Wachstumsraten Dentinringe Oligozän Mammalia 

Notes

Acknowledgments

Kind thanks to the Institut für Paläontologie (Universität Wien) for providing facilities, tools and material. The University of Vienna supported K.B. with travel grants (awards of advancement scholarships from the University of Vienna used for travel costs) for London, Paris and New York. Ursula Göhlich (NHMW), Christine Argot (MNHN), Pip Brewer (NHMUK), Andy Currant (NHMUK) and Judith Galkin (AMNH) gave access to the respective collections and granted loans. We are indebted to Andrea Tietze and the team at the DZU (Donauzentrum Urania, Vienna) for the possibility to produce the x-rays. We wish to thank Floréal Solé and one anonymous reviewer for valuable comments that led to improvement of this manuscript.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.Institut für PaläontologieUniversität WienWienAustria
  2. 2.HNO-Klinik der Medizinischen Universität Wien, Forschungsgruppe Aerobiologie und PolleninformationWienAustria

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