North Atlantic lepechinellid amphipod species were investigated using morphological and molecular techniques based on material collected during two IceAGE expeditions in 2011 and 2013 (Icelandic marine Animals: Genetics and Ecology). The presence of eyes is reported for the first time for the family Lepechinellidae. Four lepechinellid species, Lepechinella grimi, L. helgii, L. skarphedini and Lepechinelloides karii were distinct across morphological, COI and 16S data. Lepechinella arctica, L. norvegica and L. victoriae were seen to be morphologically similar. No morphological or molecular separation was observed between L. arctica and L. norvegica, indicating that these taxa should not be considered separate species. Full illustrations of habitus and mouthparts are presented for L. arctica and a new synonymy is provided recognizing L. norvegica as a junior synonym of L. arctica. While L. victoriae shows little morphological variation from L. arctica, COI and 16S data show this taxon as genetically distinct. Furthermore, new geographic and depth ranges for North Atlantic and Arctic lephechinellids are provided.

中文翻译：

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北大西洋Lepechinellidae（两栖动物：甲壳纲）的多样性和分布

北大西洋lepechinellid使用基于在2011年和2013年2名IceAGE探险（收集的物质的形态学和分子技术足目物种进行了研究冰landic海洋甲nimals：ģ enetics和ë cology）。据报道，Lepechinellidae家族首次出现了眼睛。在形态，COI和16S数据上，四种Lepechinellid物种，即Lepechinella grimi，L。helgii，L。skarphedini和Lepechinelloides karii截然不同。细叶小球藻，诺维加乳杆菌和维多利亚乳杆菌被认为在形态上相似。没有观察到L. arctica和L. norvegica之间的形态或分子分离，表明这些分类单元不应被视为单独的物种。提供了L. arctica的习性和口器的完整插图，并提供了一个新的同义词，承认L. norvegica是L. arctica的初级同义词。尽管维多利亚乳杆菌与北极乳杆菌之间的形态变化很小，但COI和16S数据表明该分类群具有遗传上的独特性。此外，还提供了北大西洋和北极麻风的新地理和深度范围。