Evidence from morphological and genetic data confirms that Colossendeis tenera Hilton, 1943 (Arthropoda: Pycnogonida), does not belong to the Colossendeis megalonyx Hoek, 1881 complex
Evidence from morphological and genetic data confirms that Colossendeis tenera Hilton, 1943 (Arthropoda: Pycnogonida), does not belong to the Colossendeis megalonyx Hoek, 1881 complex
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DOI：
10.1007/s13127-012-0120-4
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发表时间：
2013-06-01
影响因子：
1.6
通讯作者：
Leese, Florian
中科院分区：
文献类型：
--
作者：
Dietz, Lars;Krapp, Franz;Leese, Florian
在密殖目中，遗传学研究显示巨爪巨爪巨龟（Colossendeis megalonyx）是一个典型的南半球物种复合体，主要分布于南极大陆架和亚南极大陆架。然而，具有完全不同的地理分布范围的不同Colossendeis物种，Colossendeis tenera希尔顿（Journal of Entomology and Zoology，Pomona College，克莱蒙，35（1），2-4，1943）被Turpaeva（Trudy Instituta Okeanology“P. P. Shirshova”，Akademy Nauk SSSR，103，230-246，1975）认为是Colossendeis megalonyx的亚种。巨龟主要分布沿着北美太平洋沿岸，从白令海到加州州中部。这两个目前不同的物种之间的显着差异被发现在身体比例和其他特征，被Turpaeva解释为一个可能的情况下，pedomorphosis引起的深海条件。在这项研究中，我们测试的假设，Colossendeis tenera属于Colossendeis megalonyx复杂的分析可用和新的序列数据（CO 1和H3）的Colossendeis megalonyx和Colossendeis tenera以及类似的，显然密切相关的物种，Colossendeis angusta Sars（Archiv for Mathematik og Naturvidenskab，2，237-271，1877）。我们比较了这些物种的卵的形态测量数据和扫描电镜。我们的研究结果清楚地表明，Colossendeis tenera和Colossendeis angusta不是Colossendeis megalonyx复合体的一部分。一个姐妹群的关系，Colossendeis tenera和Colossendeis angusta是强烈支持的，但Colossendeis tenera是没有明确解决的单系相对于Colossendeis angusta。这项工作强调需要进一步研究的变化中发现的tenera angusta分支。它也给出了第一个暗示的系统发育的亲缘关系内的物种Colossendeis。
Within the Pycnogonida, genetic studies have revealed that Colossendeis megalonyx Hoek (Challenger Report, Zoology, 3(X), 1-167, 1881), consists of a complex of several cryptic or overlooked species. Colossendeis megalonyx is a typical Southern Hemisphere species complex distributed primarily on the continental shelves in the Antarctic and Subantarctic. However, a different Colossendeis species with a completely different geographic distribution range, Colossendeis tenera Hilton (Journal of Entomology and Zoology, Pomona College, Claremont, 35(1), 2-4, 1943), was considered a subspecies of Colossendeis megalonyx by Turpaeva (Trudy Instituta Okeanology "P. P. Shirshova", Akademy Nauk SSSR, 103, 230-246, 1975). Colossendeis tenera occurs predominantly along the Pacific Coast of North America from the Bering Sea to central California. Prominent differences between these two currently distinct species are found in body proportions and other characters that were interpreted by Turpaeva as a possible case of pedomorphosis induced by deep-sea conditions. In this study, we tested the hypothesis that Colossendeis tenera belongs to the Colossendeis megalonyx complex by analyzing available and novel sequence data (CO1 and H3) of both Colossendeis megalonyx and Colossendeis tenera as well as a similar, apparently closely related species, Colossendeis angusta Sars (Archiv for Mathematik og Naturvidenskab, 2, 237-271, 1877). We compared morphometric data and SEM of the ovigera of these species. Our results clearly indicate that Colossendeis tenera and Colossendeis angusta are not a part of the Colossendeis megalonyx complex. A sister-group relationship of Colossendeis tenera and Colossendeis angusta is strongly supported, but Colossendeis tenera is not clearly resolved as monophyletic with respect to Colossendeis angusta. This work highlights the need for further examination of the variation found in the tenera-angusta clade. It also gives a first hint of the phylogenetic affinities of species within Colossendeis.