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| Content Provider | Springer Nature Link |
|---|---|
| Author | Schmidt Kittler, Norbert |
| Copyright Year | 2002 |
| Abstract | The particular pathway of evolution of the mammalian order of the rodents as compared to the other herbivorous mammals is described. In their dentition the most important change consisted in the replacement of the primitive molar plan of the pantotherian ancestors by completely new dental structures. The new evolutionary options aquired by this, are one of the reasons for the particular evolutionary success and the great diversity of niches formed by this group. The newly developed family-specific dental patterns soon became genetically fixed, to the effect that functional optimizations — that means adaptive evolution — could only be realized through allometric change of shape and proportions. This was possible in connection with increasing hypsodonty. New descriptive parameters allowing to characterize the divergent adaptations are defined. Among them the relative amount of enamel within the occlusal surface is the most reliable indicator of feeding specialization. A comparison reveals that the small rodents in their hypsodont evolution mostly diminished the crowding in their dental patterns, whereas in the evolution of several very large mammalian herbivores quite the contrary occured. The functional reasons for this are discussed. Arguments are brought foreward that the morphological optimization of the molar dentitions of rodents can attain degrees not realizable in large hypsodont herbivores. |
| Starting Page | 141 |
| Ending Page | 152 |
| Page Count | 12 |
| File Format | |
| ISSN | 00372110 |
| Journal | Palaeobiodiversity and Palaeoenvironments |
| Volume Number | 82 |
| Issue Number | 1 |
| Language | English |
| Publisher | Springer-Verlag |
| Publisher Date | 2002-01-01 |
| Publisher Place | Berlin, Heidelberg |
| Access Restriction | Subscribed |
| Subject Keyword | Feeding specialization Rodents evolution Paleontology Biodiversity Animal Systematics/Taxonomy/Biogeography Plant Systematics/Taxonomy/Biogeography Freshwater & Marine Ecology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Paleontology |
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