著者

Masafumi MATSUI Hiroshi OKAWA Kanto NISHIKAWA Gen AOKI Koshiro ETO Natsuhiko YOSHIKAWA Shingo TANABE Yasuchika MISAWA Atsushi TOMINAGA

出版者

The Herpetological Society of Japan

雑誌

Current Herpetology (ISSN:13455834)

巻号頁・発行日

vol.38, no.1, pp.32-90, 2019 (Released:2019-02-28)

参考文献数

81

被引用文献数

23

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The abundant clouded salamander from western Japan, Hynobius nebulosus, has long been considered a single widespread species, although some authors have suggested the inclusion of several cryptic species. This led to a molecular and morphological analysis of populations from all parts of the known range. Phylogenetic relationships were inferred from complete sequences of the mitochondrial cytochrome b gene, and nuclear genome differentiations were estimated by multiplexed inter simple sequence repeat genotyping by sequencing (MIG-seq). The results suggest that H. nebulosus hitherto recognized consists of at least nine species. We applied existing names to two of them, H. nebulosus (Temminck et Schlegel) and H. vandenburghi Dunn, and described seven others as new species.

著者

Natsuhiko YOSHIKAWA

出版者

日本爬虫両棲類学会

雑誌

Current Herpetology (ISSN:13455834)

巻号頁・発行日

vol.35, no.1, pp.69-72, 2016 (Released:2016-02-26)

参考文献数

8

被引用文献数

1

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Antipredator behavior of Cynops pyrrhogaster was observed in the field. A male, found in a temporal pool (11.7C), tightly coiled his body around the observer’s finger (putative model of predator) when he was touched from lateral side. The body-coiling was formed both dextrally and sinistrally, depending on direction from which the newt’s body was touched. Undulation of tail and noxious secretion accompanied the behavior. The coiling-around behavior was aborted immediately when the newt lost physical contact with finger. Apart from this, pushing on the head with a finger caused Unken reflex, which is commonly known as defensive behavior of newts. It is suggested that C. pyrrhogaster varies their defensive behavior depending on the situation of encounter with the predator.

著者

Natsuhiko YOSHIKAWA Masafumi MATSUI

出版者

日本爬虫両棲類学会

雑誌

Current Herpetology (ISSN:13455834)

巻号頁・発行日

vol.32, no.1, pp.9-25, 2013 (Released:2013-02-22)

参考文献数

25

被引用文献数

6

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Recent phylogenetic studies using mtDNA and allozymes have revealed the presence of large genetic differentiation within a Japanese clawed salamander, Onychodactylus japonicus, suggesting the presence of several cryptic taxa in this species. Based on morphological analyses, we describe one of them from the Tsukuba Mountains of Ibaraki Prefecture, in the Kanto district of eastern Honshu, as a new species, Onychodactylus tsukubaensis. It is a member of the japonicus species complex of Onychodactylus, and differs from the other species of the complex by a relatively short tail, wide head, and large number of vomerine teeth.