A dinosaurian facial deformity and the first occurrence of ameloblastoma in the fossil record

Mihai D. DumbrǍ, Bruce M. Rothschild, David B. Weishampel, Zoltán Csiki-Sava, RǍzvan A. Andrei, Katharine A. Acheson, Vlad A. Codrea

Research output: Contribution to journalArticlepeer-review

Abstract

Despite documentation of various types of neoplastic pathologies encountered in the vertebrate fossil record, no ameloblastic tumours have been recognised so far. Ameloblastoma is a benign neoplasic tumour with a strong preponderance for the mandible. Here, we report for the first time the presence of an ameloblastoma neoplasm in the lower jaw of a specimen referred to the derived non-hadrosaurid hadrosauroid dinosaur Telmatosaurus transsylvanicus from the uppermost Cretaceous of the Haeg Basin in Romania. The location, external appearance and internal structure of the pathological outgrowth provide clear evidence for the diagnosis of ameloblastoma in Telmatosaurus. This report extends the range of pathologies encountered in hadrosauroid dinosaurs. In addition, recognition of an ameloblastoma neoplasm in a taxon lying close to the origin of 'duck-billed' hadrosaurid dinosaurs confirms the predisposition of this clade towards neoplasia pathologies already in its basal members.

Original languageEnglish (US)
Article number29271
JournalScientific reports
Volume6
DOIs
StatePublished - Jul 5 2016

ASJC Scopus subject areas

  • General

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