Fig.1. tracks identified as probable signs of a mammal that has gnawed bone by Muzzin 2010. In a press release of the provisional Yale University was announced the news in the journal Paleontology "paleontologists have published the discovery of impressions of teeth on various bones of mammals, including dinosaur. S and confirmed, these are the oldest examples of this type of ichnotraccia identified so far.
Nicholas Longrich, Yale University, is Michael J. Ryan, of the Cleveland Museum of Natural History, have discovered several bones in the collection of 'University of' Alberta and Royal Tyrrell Museum, and others during an excavation in province of Alberta.
All the fossils come from sediments of the Cretaceous, the signs were found on a femur Champsosaurus (aquatic reptile) on a dinosaur's rib (Hadrosauria / Ceratopsia indet.) Alleged ornithischio femur and a jaw of a marsupial.
L 'attribution of the signs of mammals multitubercolati is supposed to be based on two parallel grooves between them, similar to the shape of two parallel incisors, a characteristic known only from mammals in that period. Many bones show multiple signs in a row on the circumference of the 'bone.
paleontologists claim that the bones were gnawed not for stripping , ma per il loro contenuto di minerali e per soddisfare il bisogno alimentare supplementare dell' animale in questione.
Risorsa:
MUZZIN, S.T. (2010): Dinosaur-chewing mammals leave behind oldest known tooth marks. Online 16.06.2010, consultato 17.06.2010
Nicholas Longrich, Yale University, is Michael J. Ryan, of the Cleveland Museum of Natural History, have discovered several bones in the collection of 'University of' Alberta and Royal Tyrrell Museum, and others during an excavation in province of Alberta.
All the fossils come from sediments of the Cretaceous, the signs were found on a femur Champsosaurus (aquatic reptile) on a dinosaur's rib (Hadrosauria / Ceratopsia indet.) Alleged ornithischio femur and a jaw of a marsupial.
L 'attribution of the signs of mammals multitubercolati is supposed to be based on two parallel grooves between them, similar to the shape of two parallel incisors, a characteristic known only from mammals in that period. Many bones show multiple signs in a row on the circumference of the 'bone.
paleontologists claim that the bones were gnawed not for stripping , ma per il loro contenuto di minerali e per soddisfare il bisogno alimentare supplementare dell' animale in questione.
Risorsa:
MUZZIN, S.T. (2010): Dinosaur-chewing mammals leave behind oldest known tooth marks. Online 16.06.2010, consultato 17.06.2010
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