Some crocodile species are vegetative plants, but are extinct.
The philosophical teeth research has shown that some of the oldest groups of crocodileps, the knot, which contain crops and alligators, were not carnivores; In fact, they were plants. The team reports that at least three (but potentially up to six) of different varieties do not rely on the plant-based diet in the past. They are now extinct.
Medium green veggie machine
"The most interesting thing is that we have discovered how often the crocodyliforms are eaten by plants," said Keegan Melstrom, PhD student at Utah. "Our research suggests that the complex teeth that we consider to have herbivores indicate that the crocodile relatives at least three times and maybe six.
All crocodilians Today, the same common body form, ecology and live their life as generalism, Half water carnivores. As carnivores, their teeth are relatively simple, conical tools are used to propagate and tear meat and not the other. Melstrom and his endorsing advisor, Randall Irmis, chief curator of the Natural History Museum of Utah, compared to the teeth of difficulty extinct and living crocodyliforMrs. Use the method for the initial mammal mammals. Overall, they have been identified with 146 teeth from 16 different varieties of quacoding.
It quickly became clear that the extinct species showed different patterns Toothpaste Structure. Some species have been shown with multiple specialties that are not present in living species, including a function known as heterodont: regional differences in teeth or form.
"Carnivores have simple teeth, while herbivores have a much harder teeth," Melstrom explained. "Omnivores, organisms that eat both plants and animal entries, fall somewhere between my earlier research part showed that this is a sample of live teeth with teeth that have teeth crocodilians And lizards. "
"These results have shown that the main specimen between diet and teeth is found in spite of mammals and reptiles, different toothpastes and used for reptile reptiles."
Due to measuring dentistry measurements and other morphological properties, the team caused the reconstruction of destroyed crocodyliforms diets. The results show that these species had a wide range of dental difficulties – and thus the diet Too – Rather than predetermined.
In the evolutionary history of the group, the early stage of vegetative surplus crocodyliforms expired, the team explained, after the mass extinction at the end of Triassic. These species lived till the end of the Cretaceous when dinosaursur mass extinction occurred. The analysis of the team shows plant nutrients that have been developed at least three times, maybe six times in the mesozo.
"Our work shows that extinct crocodyliforms had a very different diet," Melstrom said. "Some were alive crocodilians And primarily carnivorous, others were omnivores and still others are likely specialized plants. "
"The herbivores lived on different continents at different times, some mammals and mammals and they were not even others, it suggests that the herbicular crocodyliform was successful in different environments!"
But they have not yet done their work. Some fossil crocodyliforms are teeth and, armed with the knowledge of the present research, Melstrom plans to reconstruct their diets as well. He also needs to find out why this extinct crocodiles diversified so radically after one mass extinction, but not the other, and whether the dietary ecology could play a role.
In the journal published the journal "Repeat Evolution of Herbivorous Crocodyliforms at the Age of Dinosaurs" Current biology.