Labidosaurus is an extinct genus of anapsid reptile from the Permian
period of North America. Fossils have been discovered in Texas.
It was heavily built, resembling a lizard with a large head, and
measuring about 75 centimetres (30 in) long. Unlike many other
captorhinids it had a single row of sharp, conical teeth in its jaws,
and its dietary habits are assumed to have been omnivorous.
Labidosaurus hamatus fossil
A lower jaw of
Labidosaurus was described in 2011 that shows evidence
of osteomyelitis, or an infection of the bone. It is the earliest
known example of an infection in a land vertebrate. The infection
probably developed because the pulp cavity of a broken dentary tooth
was exposed to bacteria. Although another tooth would have replaced
the broken one, regeneration would have been slow.
other derived captorhinids had teeth that were deeply implanted in the
jaws. This deep implantation limited tooth replacement, meaning that a
broken tooth would have been exposed for a long period of time.
^ Modesto, Sean P.; Scott, Diane M.; Berman, David S.; Müller,
Johannes; Reisz, Robert R. (2007). "The skull and the paleoecological
Labidosaurus hamatus, a captorhinid reptile from the
Permian of Texas". Zoological Journal of the Linnean Society.
149 (2): 237–62. doi:10.1111/j.1096-3642.2007.00242.x.
^ Reisz, Robert R.; Scott, Diane M.; Pynn, Bruce R.; Modesto, Sean P.
Osteomyelitis in a Paleozoic reptile: ancient evidence for
bacterial infection and its evolutionary significance".
Naturwissenschaften. 98 (6): 551–5.
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