Paleontological and paleogeographical studies of the first Tertiary small mammal fauna from Japan.

本研究开始时，岐阜县卡尼市多塔发现了日本第一个第三纪小型哺乳动物区系，由2目4科4属组成。本次研究和发掘增加了一种食虫动物、两种啮齿动物、两种食肉动物和一种偶蹄目动物，因此，DOTA地方动物区系目前由5目7科9属组成。它们是：Plesiosorex sp.(昆虫目)，比照AmPhilagus sp.(拉格亚目)、中华纤毛虫、中国纤毛虫Anchitheriomys n.sp.、？假异体线虫Partitheridomys sp.或五步虫属(Pentabuneomys sp.)Et n.sp.(Rodentia)、熊属(Ursoidae gen.)ET sp.Int.、杂蝇属Musteroidae Gen.ET sp.INTER.(Carnivora)和特拉格科(Traguridae Gen.)ET sp.虽然该新属仅见于捷克和岐阜县。在小型哺乳动物的6个属中，有5个属在Do…之间有共性更多的地区和欧洲，表明欧洲和亚洲之间的动物群交流是广泛的。DOTA与北美共有3个属，表明北美与亚洲的区系互换比较成功。这些事实表明，早中新世欧洲、亚洲和北美之间的动物群交换在种类繁多的哺乳动物中发生得更广泛，Dota当地动物群在区系组成上与捷克的“Merkur-Nord”区系相似。后者的年龄为欧洲陆地哺乳动物时代的MN3a，距今约2200万至2000万年(MA)。中村组产生了多塔当地的动物群，但并不产生长吻类化石，但长吻类通常是从上覆的平木组中发现的。在欧洲，口鼻出现在MN4(约18 MA)。因此，DOTA本地动物群可以与欧洲的MN3联系起来。从中村FM获得的裂变径迹年龄。多塔当地动物群的年龄约为21至19 Ma，这比之前认为的要早一些。较少

The first Tertiary small mammal fauna in Japan (=Dota local fauna) from Dota, KaniCity, Gifu Prefecture was composed of 2 orders, 4 families, and 4 genera, when the present study started. Research and excavations by this study added one insectivore, two rodents, two carnivores, and one artiodactyl ; therefore, the Dota local fauna is now composed of 5 orders, 7 families, and 9 genera. They are, Plesiosorex sp. (Insectivora), cf. Amphilagus sp. (Lagomorpha), Youngofiber sinensis, Anchitheriomys n. sp., ? Pseudotheridomys sp. or Pentabuneomys sp., Eomyidae n. gen. et n. sp. (Rodentia), Ursoidea gen. et sp. indet., Musteroidea gen. et sp. indet. (Carnivora), and Traguridae gen. et sp. indet.(Artiodactyla).Although the new genus of Eomyidae is known only from Czech and Gifu Pref. and only by a single specimen from each locality, it is very important in order to study the paleobiogeographic relationship between Europe and Asia.Out of 6 genera of small mammals, 5 genera are common between Do … More ta and Europe, indicating that the faunal interchange between Europe and Asia was extensive. 3 genera are common between Dota and North America, indicating that the faunal interchange between North America and Asia was fairly successful. These facts suggest that faunal interchange among Europe, Asia, and NOrth America during the early to middle Miocene occurred more widely among wide variety of mammals.Dota local fauna is similar to "Merkur-Nord" fauna in Czech in the faunal composition. The age of the latter is MN3a of European land mammal age and is about 22 to 20 million years ago (MA). The Nakamura Formation that yielded the Dota local fauna does not yield proboscidean fossils, but the proboscideans have been commonly known from the overlying Hiramaki Formation. Proboscideans appear in MN4 (ca. 18 MA) in Europe. Thus, the Dota local fauna can be correlated with MN3 in Europe. Fission-track ages obtained from the Nakamura Fm. Suggest that the age of Dota local fauna is about 21 to 19 MA which is somewhat older than previously thought. Less