Paläontologische Zeitschrift

, Volume 83, Issue 2, pp 227–245 | Cite as

New remains of Hungarosaurus tormai (Ankylosauria, Dinosauria) from the Upper Cretaceous of Hungary: skeletal reconstruction and body mass estimation

Research Paper

Abstract

Hungarosaurus tormai is a medium-sized nodosaurid ankylosaur that was described on the basis of four partial skeletons from the Santonian (Upper Cretaceous) of Hungary. In this paper, a new fifth skeleton and several isolated remains are described which greatly improve our knowledge of this primitive nodosaurid ankylosaur. Isolated cranial remains referred to juvenile individuals provide new information on the development of cranial ornamentation in nodosaurid ankylosaurs. Apart from both preserved mandibles with in situ dentition, the fifth partial skeleton contains several previously unknown limb elements (humerus, ulnae, radius) that indicate unusual limb proportions for Hungarosaurus compared with other ankylosaurs. On the basis of the five partial skeletons and the isolated remains, a skeletal and dermal armor reconstruction is attempted. Body mass calculations using three different methods yield an estimate of 650 kg for H. tormai.

Keywords

Hungarosaurus Late Cretaceous Iharkút Skeletal reconstruction Body mass estimation 

Kurzfassung

Hungarosaurus tormai ist ein mittelgroßer Nodosauride, der ursprünglich auf der Basis von vier Teilskeletten aus dem Santon (Oberkreide) von Ungarn beschrieben wurde. In dieser Arbeit wird ein fünftes Skelett und einige isolierte Elemente beschrieben, die unsere Kenntnis dieses primitiven Nodosauriden deutlich verbessern. Isolierte Schädelelemente von Jungtieren liefern neue Informationen zur Entwicklung der Schädelornamentation bei Nodosauriden. Neben beiden erhaltenen Unterkiefern, zum Teil noch mit Zähnen in Situ, enthält das fünfte Skelett einige bisher nicht bekannte Extremitätenknochen (Humerus, Ulnae, Radius), die darauf hinweisen, daß Hungarosaurus im Vergleich mit anderen Ankylosaurirn ungewöhnliche Bein-Proportionen besaß. Anhand der fünf Teilskelette und der isolierten Reste wird eine Rekonstruktion des gesamten Skelettes und der Panzerung versucht. Drei verschiedene Methoden der Rekonstruktion der Körpermasse ergaben eine Schätzung von 650 kg für H. tormai.

Schlüsselwörter

Hungarosaurus Obere Kreide Iharkút Skelettrekonstruktion Körpermasse-Schätzung 

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  1. 1.Research Group for PaleontologyHungarian Academy of Sciences, Hungarian Natural History MuseumBudapestHungary
  2. 2.Department of PaleontologyEötvös Loránd UniversityBudapestHungary

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