Name: Labidosaurus ‭(‬Lipped lizard‭)‬.
Phonetic: Lab-e-doe-sore-us.
Named By: Edward Drinker Cope‭ ‬-‭ ‬1896.
Synonyms: Pariotichus hamatus,‭ ‬Labidosaurus broili.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Captorhinida,‭ ‬Captorhinidae.
Species: L.‭ ‬hamatus‭ (‬type‭)‬.
Diet: Ominvore‭?
Size: Between 75-90‭ ‬centimetres long.
Known locations: USA,‭ ‬Oklahoma‭ ‬-‭ ‬Hennessey Formation.‭ ‬Texas‭ ‬-‭ ‬Arroyo Formation,‭ ‬Upper Vale Formation,‭ ‬Waggoner Ranch Formation.
Time period: Artinskian to Kungurian of the Permian.
Fossil representation: Several individuals.

       Labidosaurus is a genus of captorhinid reptile that lived in the USA in the last half of the early Permian.‭ ‬The upper jaw of Labidosaurus had a pronounced downwards hook that would have fitted around the end of the lower jaw,‭ ‬and unlike previously known captorhinids had a single row of conical teeth.‭ ‬There does not seem to have been any specialisation to the teeth,‭ ‬and in the past many have speculated that Labidosaurus may have been omnivorous.
       In‭ ‬2011‭ ‬a specimen of Labidosaurus was described as having evidence of osteomyelitis,‭ ‬which in more simple English is an infection of the bone.‭ ‬This infection was in the bone of the lower jaw,‭ ‬and is thought to have been established through a broken tooth that allowed bacteria to take hold.‭ ‬This is quite plausible since the teeth of Labidosaurus were very deep rooted,‭ ‬which meant that although they would have been continually replaced by new teeth throughout life,‭ ‬the tooth replacement process would have taken a much longer time than in relatives with shallower roots,‭ ‬allowing for far more time for an infection to take hold.
       Labidosaurus should not be confused with the similarly named captorhinid Labidosaurikos.

Further reading
-‭ ‬Second contribution to the history of the Cotylosauria.‭ ‬-‭ ‬Proceedings of the American Philosophical Society‭ ‬35‭(‬151‭)‬:122-139.‭ ‬-‭ ‬Edward Drinker Cope‭ ‬-‭ ‬1896.
-‭ ‬The skull and the paleoecological significance of Labidosaurus hamatus,‭ ‬a captorhinid reptile from the Lower Permian of Texas.‭ ‬-‭ ‬Zoological Journal of the Linnean Society‭ ‬149‭ (‬2‭)‬:‭ ‬237‭–‬62.‭ ‬-‭ ‬Sean P.‭ ‬Modesto,‭ ‬Diane M.‭ ‬Scott,‭ ‬David S.‭ ‬Berman,‭ ‬Johannes Müller‭ & ‬Robert R.‭ ‬Reisz‭ ‬-‭ ‬2007.
-‭ ‬Osteomyelitis in a Paleozoic reptile:‭ ‬ancient evidence for bacterial infection and its evolutionary significance.‭ ‬-‭ ‬Naturwissenschaften‭ ‬98‭ (‬6‭)‬:‭ ‬551‭–‬5.‭ ‬-‭ ‬Robert R.‭ ‬Reisz,‭ ‬Diane M.‭ ‬Scott,‭ ‬Bruce R.‭ ‬Pynn‭ & ‬Sean P.‭ ‬Modesto‭ ‬-‭ ‬2011.


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