著者

Hideki Endo Kimiyuki Tsuchiya

出版者

日本哺乳類学会

雑誌

Mammal Study (ISSN:13434152)

巻号頁・発行日

vol.31, no.1, pp.47-57, 2006 (Released:2006-07-08)

参考文献数

25

被引用文献数

12

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A new species of Ryukyu spiny rat, Tokudaia tokunoshimensis was described in the specimens originating from Tokunoshima Island in the southernmost region of Japan. The populations of Tokudaia are separately distributed only in Amami-Oshima, Tokunoshima, and Okinawa-jima Islands. We have described the osteological and external morphological characteristics and clarified the osteometrical distinctions among the three populations using the skull and skin collections. All external dimensions of head and body length, tail length, hindfoot length and ear length were larger in the Tokunoshima population than in the other two in mean value. The raw osteometrical data separated the Tokunoshima Island population from the other two in all measurements except for the length of molar row in the Okinawa-jima Island population. The principal component analysis also demonstrated that the skulls from the Tokunoshima Island population were morphologically distinct from those of the other populations. Here, from these findings, we point out that the Tokunoshima population of Tokudaia should be regarded as an independent species from the two other populations.

著者

Ohdachi Satoshi Yoshizawa Kazunori Hanski Ilkka Kawai Kuniko Dokuchaev Nikolai E. Sheftel Boris I. Abramov Alexei V. Moroldoev Igor Kawahara Atsushi

出版者

Mammalogical Society of Japan

雑誌

Mammal Study

巻号頁・発行日

vol.37, no.4, pp.281-297, 2012-12

被引用文献数

10

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Phylogenetic analysis was conducted for various populations of the Sorex minutissimus-S. yukonicus complex based on mitochondrial gene (cytochrome b and/or the control region) sequences. Sorex minutissimus was divided into some monophyletic groups in Eurasia; it was divided into 2 main groups, eastern and western Eurasian clades, based on combined data of the cytochrome b and the control region. Monophyly of shrews from Hokkaido-Sakhalin, Primorye, Mongolia-Transbaikalia, southeastern Finland was strongly supported respectively in most analyses. Sorex yukonicus was phylogenetically close to S. minutissimus in eastern Siberia. Some shrews from western and central Siberia were included in the clade of southeastern Finland. Also, most shrews from central-northern Finland and Norway made a clade close to but different from the southeastern Finland clade. This finding suggests that Fennoscandian shrews might consist of individuals which were recolonised from various refugia after the Last Glacial Maximum. Nucleotide diversity of shrews from Hokkaido and Alaska was low. Three regional groups in Kamchatka-Sakha, Sakhalin, and Mongolia-Transbaikalia tended to have medium nucleotide diversity. In contrast, shrews from Cisbaikalia-western Siberia and Fennoscandia had high nucleotide diversity. The S. minutissimus-S. hosonoi group appears to have experienceed a quit different biogeographic history from two shrews with similar ranges, the S. caecutiens-S. hosonoi group and S. tundrensis.

著者

Kawada Shin-ichiro Koyasu Kazuhiro Zholnerovskaya Elena I. ODA Sen-ichi

出版者

日本哺乳類学会

雑誌

Mammal study (ISSN:13434152)

巻号頁・発行日

vol.27, no.2, pp.107-111, 2002-12-01

被引用文献数

2 2

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The upper dental formula of the Russian desman Desmana moschata (Linnaeus, 1758) (Insectivora, Talpidae) is considered based on the position of the premaxillary suture (sutura incisiva). From the lateral aspect, this suture extends to the second tooth in the tooth row. From the ventral aspect, the suture connects the common alveolus fossa of the second and third teeth in front of the second tooth on the labial edge and behind it on the lingual edge; consequently, the third tooth in the upper row appears to be derived from the maxilla. Therefore, the upper tooth formula of D. moschata may differ from the traditional fundamental dental formula of eutherian mammals (I3, C1, P4, M3), and consist of two incisors, one canine, five premolars, and three molars (I2, C1, P5, M3). This hypothetical view, however, assumes two changes, a tooth deletion in the incisor row and an addition in the premolar row. The significance of the premaxillary suture and possible pitfalls in using it to define dental formulae are discussed.

著者

Kawada Shin-ichiro Harada Masashi Koyasu Kazuhiro ODA Sen-ichi

出版者

日本哺乳類学会

雑誌

Mammal study (ISSN:13434152)

巻号頁・発行日

vol.27, no.1, pp.91-94, 2002-06-01

被引用文献数

7 7

著者

Shinohara Akio Kawada Shin-ichiro Harada Masashi KOYASU Kazuhiro ODA Sen-ichi SUZUKI Hitoshi

出版者

日本哺乳類学会

雑誌

Mammal study (ISSN:13434152)

巻号頁・発行日

vol.33, no.2, pp.77-82, 2008-06-01

被引用文献数

9

著者

Moribe Junji Yokohata Yasushi

出版者

Mammalogical Society of Japan

雑誌

Mammal study (ISSN:13434152)

巻号頁・発行日

vol.36, no.3, pp.135-139, 2011-09-01

著者

Kaneko Yukibumi

出版者

日本哺乳類学会

雑誌

Mammal study (ISSN:13434152)

巻号頁・発行日

vol.27, no.1, pp.31-63, 2002-06-01

被引用文献数

3 8

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I classified about 600 museum specimens of Père David's vole and examined its distribution. In a restricted area of Burma (25.70-26.13°N, 98.13-98.70°E; Myanmar, Area V), 150 individual specimens sampled during the same period could be classified into two groups on the basis of the relationship between the hind foot length (HFL) and tail length (TL): the large (L) and small (S) types. Group L was distributed at altitudes above 2460 m, whereas Group S was found below 2460 m. The distance between the incisor and third upper molar (I-M3) exceeded 14.3 mm in Group L, and was less than 15.2 mm in Group S. Except for young individuals, specimens from Groups L and S from Area V differed in two external and 14 cranial measurements. The molar pattern of the third upper molar ranged from simple to complex types, and varied both within and between Groups L (Types B, C, and D) and S (Types B and C), indicating that it is inadequate as a primary diagnostic character. The relationship between TL and HFL differentiated the groups in Areas III, IV (Yunnan Province, China), VI (India, Thailand, Vietnam, and northern Burma), and VII (the provinces of Zhejiang and Fujian in China, and Taiwan), but did not differentiate them in Areas I (the provinces of Hubei and Guizhou) or II (the provinces of Gansu and Sichuan), where histograms of I-M3 distinguished Groups L and S. Proportional likeness was represented using a ratio diagram; the lines for 11 cranial dimensions distinguished Group L from Group S, indicating that they are two distinct species. Group L was identified as Eothenomys mucronatus (Allen, 1912); it was distributed in Areas II, III, V, and VI. Group S was identified as E. melanogaster (Milne-Edwards, 1872); it was distributed in Areas I, II, IV, V, and VII. The elevations at which E. melanogaster occurred decreased from southwest to northeast, whereas no clear altitudinal tendency was seen in E. mucronatus.

著者

Kaneko Yukibumi

出版者

Mammalogical Society of Japan

雑誌

Mammal study (ISSN:13434152)

巻号頁・発行日

vol.35, no.1, pp.31-55, 2010-03-01

被引用文献数

2

著者

Kaneko Yukibumi

出版者

Mammalogical Society of Japan

雑誌

Mammal study (ISSN:13434152)

巻号頁・発行日

vol.36, no.1, pp.11-22, 2011-03-01

被引用文献数

1