The sessile benthic fauna on ferromanganese (Fe-Mn) crusts is poorly known, with many groups of invertebrates still barely examined. Collections made during Yuzhmorgeologiya expeditions on RV Gelendzhik in October 2016 (YMG 6–16) and October 2020 (YMG 6–19) to the Magellan Seamounts, tropical western Pacific, have yielded two new species and a new genus of cheilostome bryozoans. These are Allantocallopora makarikhini sp. nov., obtained at Stn 14B135 from the Kotzebue Guyot, 17.3800°N, 153.0800°E, at 1505 m depth, and Melnikum magellanum gen. et sp. nov., collected at Stn 08D108 from the Govorov Guyot, 17.8984°N, 151.2415°E, at 2036 m depth. Colonies of these new species were attached to the surface of cobalt-rich Fe-Mn crusts, representing a rare example of detection of Bryozoa on Fe-Mn crusts in the deep-sea. A literature review revealed 23 reports documenting bryozoans on the surfaces of Fe-Mn crusts or the deposition of Fe-Mn oxides on the surface of bryozoan colonies, defined as ferrugination. Fe-Mn crust-associated Bryozoa have been found at 29 localities in ten regions of the world’s oceans, in a depth range of 400–5850 m, with the majority of finds made in the central to southwestern Pacific. Most of these reports were based on preliminary data; they identified nine bryozoan taxa to the species level. Fe-Mn crust-associated bryozoans show low local species richness, up to four species per locality, and generally low abundance. Analyses of published data suggest that this apparent low richness might be due to the short history of investigations of crusts and strongly affected by the sampling method. Thorough inventories of Fe-Mn crust-associated bryozoans are urgently needed; bryozoans are a component of the sessile biota, which is sensitive and vulnerable to the proposed mining of Fe-Mn crusts as an important mineral resource in the deep sea.

铁锰（Fe-Mn）结壳上的固着底栖动物群鲜为人知，许多无脊椎动物群仍然几乎没有被检查过。在 2016 年 10 月 ( YMG 6-16) 和 2020 年 10 月 (YMG 6-19) 到热带西太平洋麦哲伦海山的 Yuzhmorgeologiya 探险期间，收集到了两个新物种和一个新属的裂口苔藓虫。这些是Allantocallopora makarikhini sp。11 月，在 Stn 14B135 从 Kotzebue Guyot、17.3800°N、153.0800°E、1505 m 深度和Melnikum magellanum处获得将军 等人。11 月 11 日，在 Stn 08D108 从 Govorov Guyot 收集，17.8984°N，151.2415°E，深度 2036 m。这些新物种的菌落附着在富含钴的铁锰结壳表面，这是在深海中在铁锰结壳上发现苔藓虫的罕见例子。文献回顾显示 23 份报告记录了苔藓虫在 Fe-Mn 结皮表面或苔藓虫菌落表面上的 Fe-Mn 氧化物沉积，定义为铁锈化。与铁锰结壳相关的苔藓虫已在世界大洋 10 个区域的 29 个地点发现，深度范围为 400-5850 m，其中大部分发现于太平洋中部至西南太平洋。这些报告大多基于初步数据；他们在物种水平上确定了九个苔藓虫类群。与铁锰结壳相关的苔藓虫表现出较低的当地物种丰富度，每个地方最多四个物种，通常丰度较低。对已发表数据的分析表明，这种明显的低丰度可能是由于结壳研究的历史较短，并且受到采样方法的强烈影响。迫切需要彻底清查与铁锰结壳相关的苔藓虫；苔藓虫是固着生物群的一个组成部分，它对作为深海重要矿产资源的铁锰结壳的拟议开采敏感和脆弱。