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A new eutriconodont mammal from the early Cretaceous Jehol Biota of Liaoning,China |
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| Authors: | Shilin Hou Jin Meng |
| Institution: | 1. Department of Geology, Northeastern University, Shenyang, 110819, China 2. Paleontological Institute, Shenyang Normal University, Shenyang, 110034, China 3. Division of Paleontology, American Museum of Natural History, New York, 10024, NY, USA 4. Key Laboratory of Vertebrate Evolution and Human Origin of Chinese Academy of Sciences, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing, 100044, China |
| Abstract: | A new genus and species of eutriconodont mammal, Chaoyangodens lii gen. et sp. nov., from the Dawangzhangzi bed of Yixian Formation, Lingyuan, Liaoning, is reported. The new species has a tooth formula I5-C1-P1-M3/i4-c1-p1-m4, unique among eutriconodonts in having only one premolar in lower and upper jaws, respectively, and a distinctive diastema between the canine and the premolar. Its simple incisors and reduced premolars show a mosaic combination of primitive and derived features. This new taxon adds to the diverse group of Jehol eutriconodonts. Among the known species from at least three horizons, there seems no evolutionary trend in morphology that is recognizable, except for that larger species are all from the Lujiatun bed of the Yixian Fm. A thorough and systematic analysis involving all the Jehol eutriconodonts is needed to understand their phylogenetic relationships. |
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