275 Million-year-old estate was first known toothache

Edward drinker cope was not exactly known for his sunny disposition. A major player in the "Bone wars" of the late 19th century, his long-running feud with other bones sharp Othniel Charles Marsh is scientific legendary. The two former friends changed about everything from fossil sites on the naming rights of extinct creatures, 1890 spill with their embarrassing spat in public view on the New York Herald.

Marsh was not the only source which faced periodic discomfort and irritation cope. In the early 1990s, photographer Louis Psihoyos and writer John Knoebber borrowed from advanced bone for a naturalist - and unauthorized road trip-, achieving some cope intellectual descendants. On the way they met with paleontologist Paul Sereno, the recognized that cope teeth that extra grumpy abscess had the cantankerous fossil Hunter without doubt at the time of his death in 1897.

An example of one of the many prehistoric creatures cope during his career with the name also suffered from a painful dental pathology. Was found in the about 275-million-year-old rock of the mid-west of the United States, Labidosaurus one lizard-like reptiles as Captorhinids of early radiation known, and cope first described it in 1896. Discovered numerous discoveries since that time, but a - CMNH 76876 - shows the earliest evidence of a bacterial infection, but in a country living vertebrates.

The peculiar dental anatomy of Labidosaurus was at least part of the blame for his ailment. According to paleontologist Robert Reisz, Diane Scott, Bruce Pynn and Sean Modesto tooth can substitute the reptile have distinguished more susceptible for injury and disease. In other reptiles of the time the teeth were only loosely in the cheek and were constantly at by newer teeth being replaced in the same ausgebrochen. Labidosaurus and other Captorhinids, on the other hand had not only teeth that were more fixed on the jaw, but new teeth broke slower in different positions. If one of their teeth, broken in other words, the area would be more susceptible to infections due to the long and unusual patterns of the replacement.

A line drawing of the skull of Labidosaurus (above) and a close-up of the lower jaw of designated CMNH 76876 shows two missing teeth (tp1, tp3) and an abscess. By Reisz et al., 2011.

In the Labidosaurus sample by Reisz and colleagues examined the first and third teeth in the jaw broken. The sockets had with bones was filled. This was strange. Broken teeth would have been lost in other reptiles and new would have taken their place, but instead developed in this Labidosaurus pathology. The pathology showed developed three empty tooth Sockets and a nearby abscess also a deep infection and the degree, which pointed out that the animal had lived with the damage for some time.

Will we never know what exactly is happening but the scientists behind the new study could the sequence of events to reconstruct. The unfortunate Labidosaurus first lost two teeth on the front of the jaw and oral bacteria had be caught in the jaw, if the damaged tooth covered roots by bone. But it got only worse from there. The bacteria caused a serious infection of bone, with the loss of three teeth and irreversible damage in the inflamed, pus oozing part of the jaw. If they contribute to the death of the Labidosaurus chronic infection, it was still active when the animal died.

Cope was not a particularly close relative of Labidosaurus - the ancestors and collateral relatives of mammals had already split from their common ancestor with reptiles long before 275 million years ago - but the injuries in the influential naturalist and the reptile lizard-like can be traced back to a similar condition. Although the anatomy of own JAWS is different from Labidosaurus is, we get only two sets of teeth during our lifetime, and this allows injuries and diseases to run rampant, if we go not in treatment. Cope could this bit of evolutionary inheritance from earlier mammals due to his chronic tooth problems, even though his hostility to Marsh alone left him feeling much sore have guilt.

Top image: a recovery of the Labidosaurus of ?. ???. Image from Wikimedia Commons.

References: Reisz, R., Scott, D., Pynn, B., & Modesto, S. (2011). Osteomyelitis in a Paleozoic reptile: ancient evidence for bacterial infection and its evolutionary significance to science DOI: 10.1007/s00114-011-0792-1

Brian Switek is a freelance science journalist and researcher at the New Jersey State Museum. He is also author of the book written in stone.
Follow @ Laelaps on Twitter.