New fossil anurans from the Lower Cretaceous Sasayama Group of Hyogo Prefecture, Western Honshu, Japan
New fossil anurans from the Lower Cretaceous Sasayama Group of Hyogo Prefecture, Western Honshu, Japan
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DOI：
10.1016/j.cretres.2015.12.024
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发表时间：
2016-06-01
影响因子：
2.1
通讯作者：
Matsui, Masafumi
中科院分区：
文献类型：
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作者：
Ikeda, Tadahiro;Ota, Hidetoshi;Matsui, Masafumi
我们描述了两个保存完好的和明确的化石无尾类出土的早白垩世Sasayama组在兵库县，日本本州西部，作为新的分类群的基础上的独特组合的字符状态。我们进行了系统发育分析，包括这些新的类群，以及中生代和古代无尾类。这一分析有力地支持了这两个新分类群的单系性，它们都比中国下白垩统现存的Leiopelmatids或Liaobatrachus位于更衍生的位置。来自日本铁鸟群的无尾类标本没有被分配到这两个新的类群，这表明在早白垩世至少有三个无尾类类群存在于日本。这些日本代表与欧亚大陆东部已知的无尾类化石没有密切关系，不像最近描述的来自这两个地区的白垩纪蜥蜴。(C)2016爱思唯尔有限公司版权所有
We describe two well-preserved and articulated fossil anurans excavated from the Lower Cretaceous Sasayama Group in Hyogo Prefecture, Western Honshu, Japan, as new taxa on the basis of unique combinations of character states. We performed a phylogenetic analysis that included these new taxa, as well as Mesozoic and archaic anurans. This analysis strongly supports the monophyly of each of the two new taxa, both of which are placed in more derived positions than extant leiopelmatids or Liaobatrachus from the Lower Cretaceous in China. Anuran specimens from the Tetori Group of Japan are not assigned to the two new taxa, suggesting that at least three anuran taxa were present in Japan during the Early Cretaceous. These Japanese representatives are not closely related to known fossil anurans from Eastern Eurasia, unlike recently described Cretaceous lizards from these two regions. (C) 2016 Elsevier Ltd. All rights reserved.