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 Anna Bastl, Doris Nagel

Veröffentlichungen: Beitrag in FachzeitschriftArtikelPeer Reviewed


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
FachzeitschriftPalaeontologische Zeitschrift
PublikationsstatusVeröffentlicht - 2013

ÖFOS 2012

  • 105118 Paläontologie


  • Hyaenodon, Tooth eruption sequence, Growth rates, Dental rings, Oligocene , Mammalia