Two new Salamanders of the genus Onychodactylus from Eastern Honshu, Japan (Amphibia, Caudata, Hynobiidae)
Two new Salamanders of the genus Onychodactylus from Eastern Honshu, Japan (Amphibia, Caudata, Hynobiidae)
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DOI：
10.11646/zootaxa.3866.1.3
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发表时间：
2014-09-22
期刊：
影响因子：
0.9
通讯作者：
Matsui, Masafumi
中科院分区：
文献类型：
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作者：
Yoshikawa, Natsuhiko;Matsui, Masafumi
我们根据形态和遗传证据描述了来自日本本州东部的甲指蝾螈属的两个新种。中间甲指十一月分布于东北地区南部以及茨城县和新泻县北部，之前被报道为S-东北群。中间甲指（Onychodactylus intermedius）属于日本甲指（O. japonicus）种群，与其他同类的不同之处在于具有较长的尾部、狭窄的头部、较短的吻部、18节骶前椎骨以及明显弯曲且无间隙的犁骨齿列。褐指甲藻 sp.十一月仅在东北地区和北陆地区的福岛县和新泻县的四个地区已知。它也属于日本刺参复合体，但缺乏背纹，这是该物种复合体的诊断特征。在其他特征上，O. fuscus与其他同类的不同之处在于尾部较长，头部和内部空间较宽，犁骨齿列呈浅弯曲且有间隙，犁骨齿相对较少。这里描述的两个物种都在冬季繁殖。从系统发育上看，这两个新种彼此密切相关，形成了一个支持良好的进化枝，其中筑波 O. tsukubaensis 是它们的姐妹种。中间甲指十一月已知与 O. japonicus 和 O. nipponoborealis 是近亲关系，但没有杂交，而 O. fuscus sp. 与 O. fuscus sp. 没有杂交。十一月至少在一个已知地点与 O. japonicus 是同域的，微卫星位点分析表明它们是生殖隔离的。
We describe two new species of hynobiid salamanders in the genus Onychodactylus from eastern Honshu, Japan, based on the morphological and genetic evidence. Onychodactylus intermedius sp. nov. is distributed in southern part of Tohoku District and northern Ibaraki and Niigata Prefectures, and was previously reported as S-Tohoku group. Onychodactylus intermedius belongs to the O. japonicus species complex, and differs from the other congeners in having relatively long tail, narrow head, short snout, 18 presacral vertebrae, and distinctly curved vomerine tooth series without gap. Onychodactylus fuscus sp. nov. is known from only four localities in Fukushima and Niigata Prefectures of Tohoku and Hokuriku Districts. It also belongs to the O. japonicus complex, but lacks the dorsal stripe, which is a diagnostic character of the species complex. In other characteristics, O. fuscus differs from the other congeners in having comparatively long tail, wide head and internarial space, shallowly curved vomerine tooth series with gap, and relatively few vomerine teeth. Both species described here breed in winter. Phylogenetically, the two new species are closely related to each other, forming a well-supported clade with O. tsukubaensis as their sister species. Onychodactylus intermedius sp. nov. is known to be parapatric with O. japonicus and O. nipponoborealis without hybridization, whereas O. fuscus sp. nov. is sympatric with O. japonicus at least in a single known locality, and analysis of microsatellite loci indicates they are reproductively isolated.