Contribution to the systematics of the genus Eurythenes S.I. Smith in Scudder, 1882 (Crustacea: Amphipoda: Lysianassoidea: Eurytheneidae)
Contribution to the systematics of the genus Eurythenes S.I. Smith in Scudder, 1882 (Crustacea: Amphipoda: Lysianassoidea: Eurytheneidae)
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对 Eurythenes S.I. Smith 属系统学的贡献，收录于 Scudder，1882（甲壳纲：片足纲：Lysianassoidea：Eurytheneidae）
DOI：
10.11646/zootaxa.3971.1.1
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发表时间：
2015
期刊：
影响因子：
0.9
通讯作者：
C. Havermans
中科院分区：
文献类型：
--
作者：
C. D. D’ACOZ;C. Havermans
Eurythenes S.I. Smith 属 Scudder，1882 年被认为由三个高度独特的物种组成：E. gryllus (Lichtenstein in Mandt, 1822)、E. thurstoni Stoddart & Lowry, 2004 和 E. obesus (Chevreux, 1905)。 E. gryllus 被认为是一种常见的世界性和广栖性物种，记录深度可达 7800 m。然而，对新采集样本的DNA序列（COI、16S、28S）结合GenBank序列的分析揭示了E. gryllus sensu lato中存在9个遗传谱系。样本是通过造树方法在不同的、支持良好的分支中回收的，并通过与其他 lysianassoid 物种记录的种间值相同范围内的遗传差异进行分离。此外，在某些情况下，在同一采样地点发现了不同的谱系。直接检查了九个分支中六个的样本。除了一个例外，这些分支之间存在微小但一致的形态差异。因此，本文在 E. gryllus 复合体内识别出五种形态种：E. andhakarae sp。十一月（南极洲西部，深海），E. gryllus（双极，深海），E. magellanicus H. Milne Edwards，1848（合恩角和巴西盆地，深海），E. maldoror sp。十一月（近世界性，深海），E. sigmiferus sp。十一月（至少是西大西洋，可能近乎国际化，深渊）。
The genus Eurythenes S.I. Smith in Scudder, 1882 was previously considered as consisting of three highly distinctive species: E. gryllus (Lichtenstein in Mandt, 1822), E. thurstoni Stoddart & Lowry, 2004 and E. obesus (Chevreux, 1905). E. gryllus has been considered as a common cosmopolitan and eurybathic species recorded down to a depth of 7800 m. However, the analysis of DNA sequences (COI, 16S, 28S) of newly collected specimens combined with GenBank sequences revealed the existence of nine genetic lineages within E. gryllus sensu lato. Specimens were recovered by tree-construction methods in distinct, well-supported clades and were separated by genetic divergences in the same range as interspecific values documented for other lysianassoid species. Furthermore, in some cases, different lineages were found at the same sampling locality. Specimens of six of the nine clades were examined directly. With one exception, these clades are separated by small but consistent morphological differences. As a consequence, five morphospecies are recognized herein within the E. gryllus complex: E. andhakarae sp. nov. (West Antarctica, abyssal), E. gryllus (bipolar, bathyal), E. magellanicus H. Milne Edwards, 1848 (Cape Horn and Brazil Basin, abyssal), E. maldoror sp. nov. (nearly cosmopolitan, abyssal), E. sigmiferus sp. nov. (at least West Atlantic, possibly nearly cosmopolitan, abyssal).