Eulimidae is a highly diverse family of gastropods that are often parasites of echinoderms. They are cosmopolitan and live from the intertidal to great depths. Despite its wide geographic and bathymetric distribution, no species of Eulimidae have been reported for the Salas & Gómez Ridge to date. In this study, we describe Melanella martarum sp. nov., which was collected during the EPIC oceanographic cruise onboard RV Mirai (JAMSTEC, Japan) in 2019. Seven specimens were collected with a modified Agassiz trawl on the summit of seamount “Pearl” (Zhemchuznaya) in the Salas & Gómez Ridge (25.59°S, 89.13°W) at 545 m depth. The morphology of M. martarum sp. nov. was compared with other Melanella species reported for the area, including Chile and Rapa Nui. DNA was extracted and partial sequences of the mitochondrial genes Cytochrome Oxidase 1 (COI) and 16S rDNA, and the nuclear gene Histone 3 (H3) were sequenced. Melanella martarum sp. nov. has morphological characteristics that separate it from other species of Melanella, such as the thickness and color of the shell, and the shape of the protoconch. In addition, M. martarum sp. nov. was genetically differentiated from other Melanella spp. sequences (uncorrected p distances from 18,1–8.6% in mitochondrial COI and 16S rDNA to 3% in nuclear H3 sequences). Although there is not much molecular data available for Eulimidae, the phylogenetic analysis confirms the results obtained by morphology, placing the species found on the Salas & Gómez Ridge within the genus Melanella. The current study advances the understanding of the poorly known benthic fauna found on seamounts in the easternmost part of the Sala & Gómez ridge, a location distinguished by a high level of endemism.

中文翻译：

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黑霉属十一月（腹足纲：Eulimidae）：萨拉斯和戈麦斯海岭报告的第一种寄生深海蜗牛

Eulimidae 是腹足动物的一个高度多样化的家族，通常是棘皮动物的寄生虫。它们是世界性的，生活在从潮间带到深海的地方。尽管地理分布和水深分布广泛，但迄今为止，萨拉斯和戈麦斯山脊还没有报道过 Eulimidae 物种。在这项研究中，我们描述了 Melanella martarum sp。 11 月 11 日，该样本是在 2019 年 RV Mirai（JAMSTEC，日本）的 EPIC 海洋学巡航期间采集的。在萨拉斯和戈麦斯海岭的海山“珍珠”（Zhemchuznaya）山顶（25.59 °S，89.13°W），深度 545 m。 M. martarum sp. 的形态。十一月与该地区报告的其他Melanella物种（包括智利和拉帕努伊）进行了比较。提取 DNA，并对线粒体基因细胞色素氧化酶 1 (COI) 和 16S rDNA 以及核基因组蛋白 3 (H3) 的部分序列进行测序。黑霉属十一月具有区别于其他黑贝壳属的形态特征，例如壳的厚度和颜色，以及原壳的形状。此外，M. martarum sp。十一月与其他 Melanella spp 有遗传差异。序列（未校正的 p 距离从线粒体 COI 和 16S rDNA 中的 18.1–8.6% 到核 H3 序列中的 3%）。尽管没有太多关于 Eulimidae 的分子数据，但系统发育分析证实了形态学获得的结果，将在萨拉斯和戈麦斯山脊发现的物种归入 Melanella 属。目前的研究增进了对萨拉和戈麦斯海岭最东部海山上发现的鲜为人知的底栖动物群的了解，该地区以高度特有性为特征。