A new species of sirenia (Mammalia: Hydrodamalinae) from the Shiotsubo Formation in Takasato, Aizu, Fukushima Prefecture, Japan
| Autor: | Shigeo Miyazaki, Hideo Horikawa, Shoji Kobayashi |
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| Rok vydání: | 1995 |
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| Zdroj: | Journal of Vertebrate Paleontology. 15:815-829 |
| ISSN: | 1937-2809 0272-4634 |
| DOI: | 10.1080/02724634.1995.10011264 |
| Popis: | A new sirenian from upper Miocene rocks (8 ± 2 Ma) in Takasato, Fukushima Prefecture, Japan, is described as Dusisiren takasatensis, sp. nov. (Sirenia: Hydrodamalinae), based on the skull, scapula, and forelimb. The geologic age, locality of the new species, and its skull size are similar to those of Dusisiren dewana, which is morphologically, chronologically, and phyletically intermediate between Dusisiren jordani and Hydrodamalis cuestae Domning. However, Dusisiren takasatensis has an anteroposterior arrangement of cheek-tooth alveoli in contrast to the bucco-lingual arrangement in D. dewana, and a large occipital condylar articular surface compared to D. dewana. The new species is more derived than D. dewana in reduction of the alveolar process, a mandolin-like shape of the palate of the maxilla as in H. cuestae, a decreased backward extension of the zygomatic process of the jugal, and a decreased rostral deflection. It is more derived than D. jordani in displaying a contact between the palati... |
| Databáze: | OpenAIRE |
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