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Amphipods from the Wallaby-Zenith Fracture Zone, Indian Ocean: new genus and two new species identified by integrative taxonomy
Systematics and Biodiversity ( IF 1.9 ) Pub Date : 2020-01-02 , DOI: 10.1080/14772000.2020.1729891
Johanna N. J. Weston 1 , Rachael A. Peart 2 , Alan J. Jamieson 1
Affiliation  

The Wallaby-Zenith Fracture Zone, within the Wharton Basin of the East Indian Ocean, is a geomorphologically complex structure with depths from abyssal to hadal (∼6600 m) with limited published taxonomic data. To fill this knowledge gap, this study describes two new species of scavenging amphipods, Stephonyx sigmacrus sp. nov. (Uristidae) and Civifractura serendipia gen. et sp. nov. (Alicellidae), collected using baited traps from a depth of 4932 m. As identification of deep-sea amphipods is challenged by phenotypic plasticity and convergent evolution, we combined a morphological with a molecular phylogenetic analysis of two mitochondrial (16S rDNA and COI) and two nuclear (Histone 3 and 28S rRNA) regions, where possible (no genetic material was obtainable from S. sigmacrus sp. nov.). The genetic data uncovered cryptic taxonomy and elevated diversity within the non-monophyletic Alicellidae family and provided evidence for establishing a new genus. Additionally, we identified morphological variations from the Tectovalopsis wegeneri description, genetically resolved two previously identified specimens of Diatectonia sp. as T. wegeneri, and identified two new species of Tectovalopsis for future description. These investigations highlight the application of integrative taxonomic approaches and represent a potential model for resolving incongruent morphological and molecular phylogenies for deep-sea amphipods and other specimen-limited taxa. Paper – zoobank.org:pub:79BC3A33-4FB2-404B-B7CB-EC401B392817 Civifractura – zoobank.org:act:E513D9AB-C258-4079-B192-BB453D7F0CBA Civifractura serendipia – zoobank.org:act:B7110CA9-365C-4D0A-899D-5BFFDAD4A05E Stephonyx sigmacrus – zoobank.org:act:DDAB1B8D-8359-49FE-B1C7-42E10CE7C9F8

中文翻译:

印度洋袋鼠-天顶断裂带的片脚类动物:综合分类法确定的新属和两个新种

Wallaby-Zenith 断裂带位于东印度洋沃顿盆地内,是一个地貌复杂的结构,深度从深海到深海 (~6600 m),已发表的分类数据有限。为了填补这一知识空白,本研究描述了两种新的清除片脚类动物 Stephonyx sigmacrus sp。十一月 (Uristidae) 和 Civifractura serendipia gen。等 sp. 十一月 (Alicellidae),使用诱饵陷阱从 4932 m 的深度收集。由于深海片脚类动物的鉴定受到表型可塑性和趋同进化的挑战,我们将形态学与两个线粒体(16S rDNA 和 COI)和两个核(组蛋白 3 和 28S rRNA)区域的分子系统发育分析相结合,在可能的情况下(无遗传材料可从 S. sigmacrus sp. nov. 获得)。遗传数据揭示了非单系 Alicellidae 科内神秘的分类学和更高的多样性,并为建立新属提供了证据。此外,我们从 Tectovalopsis wegeneri 描述中确定了形态变异,遗传解析了两个先前确定的 Diatectonia sp. 标本。作为 T. wegeneri,并确定了两个新的 Tectovalopsis 物种以供将来描述。这些调查突出了综合分类学方法的应用,并代表了解决深海片脚类动物和其他标本受限类群不一致的形态和分子系统发育的潜在模型。论文 – zoobank.org:pub:79BC3A33-4FB2-404B-B7CB-EC401B392817 Civifractura – zoobank.org:act:E513D9AB-C258-4079-B192-BB453D7F0CBA Civifractura:zoobank.org:
更新日期:2020-01-02
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