, 98:551

Osteomyelitis in a Paleozoic reptile: ancient evidence for bacterial infection and its evolutionary significance


    • Department of BiologyUniversity of Toronto Mississauga
  • Diane M. Scott
    • Department of BiologyUniversity of Toronto Mississauga
  • Bruce R. Pynn
    • Oral and Maxillofacial SurgeryThunder Bay Regional Health Sciences Centre
  • Sean P. Modesto
    • Department of BiologyCape Breton University
Short Communication

DOI: 10.1007/s00114-011-0792-1

Cite this article as:
Reisz, R.R., Scott, D.M., Pynn, B.R. et al. Naturwissenschaften (2011) 98: 551. doi:10.1007/s00114-011-0792-1


We report on dental and mandibular pathology in Labidosaurus hamatus, a 275 million-year-old terrestrial reptile from North America and associate it with bacterial infection in an organism that is characterized by reduced tooth replacement. Analysis of the surface and internal mandibular structure using mechanical and CT-scanning techniques permits the reconstruction of events that led to the pathology and the possible death of the individual. The infection probably occurred as a result of prolonged exposure of the dental pulp cavity to oral bacteria, and this exposure was caused by injury to the tooth in an animal that is characterized by reduced tooth replacement cycles. In these early reptiles, the reduction in tooth replacement is an evolutionary innovation associated with strong implantation and increased oral processing. The dental abscess observed in L. hamatus, the oldest known infection in a terrestrial vertebrate, provides clear evidence of the ancient association between terrestrial vertebrates and their oral bacteria.


Paleozoic tetrapodsOsteomyelitisCaptorhinidaeDental abscessEarly Permian

Copyright information

© Springer-Verlag 2011