Xenophyophores are important megafaunal organisms in the abyssal Clarion-Clipperton Zone (CCZ; equatorial Pacific), a region hosting commercially significant deposits of polymetallic nodules. Previous studies assigned those with attached, fan-like tests to Psammina limbata, a species described from the central CCZ based on morphology. Here, we redescribe the holotype of P. limbata and then show that limbata-like morphotypes collected in the eastern CCZ include three genetically distinct species. Psammina aff. limbata is closest morphologically to P. limbata. The others are described as P. microgranulata sp. nov. and P. rotunda sp. nov. These fan-shaped species form a well-supported clade with P. tortilis sp. nov., a morphologically variable species exhibiting features typical of both Psammina and Semipsammina. A second clade containing Psammina sp. 3, and two species questionably assigned to Galatheammina branches at the base of this group. The genus Psammina includes another 9 described species for which there are no genetic data, leaving open the question of whether Psammina as a whole is monophyletic. Our study increases the number of xenophyophore species described from the eastern CCZ from 8 to 11, with a further 25 morphotypes currently undescribed. Many additional species of these giant foraminifera undoubtedly await discovery in abyssal settings.

异生植物是深海克拉里昂-克利珀顿区（CCZ；赤道太平洋）中重要的大型真菌生物，该地区拥有商业上重要的多金属结核矿床。先前的研究将那些进行了类似扇形测试的动物分配给Psammina limbata，该种是从CCZ中央根据形态描述的。在这里，我们重新描述了P. limbata的全型，然后显示了在CCZ东部收集的类似于limtata的形态型包括三个遗传上不同的物种。Psammina AFF。角膜缘在形态学上最接近角膜缘毕赤酵母。其他被描述为P. microgranulata sp.。十一月 和圆形建筑sp。十一月 这些扇形的物种与P. tortilis sp。形成了支撑良好的进化枝。nov。，一种形态学可变的物种，展现了沙门氏菌和塞米沙门氏菌的典型特征。第二个包含Psammina sp。3，并且有两个物种可疑地分配给了该组基地的Galatheammina分支。沙门氏菌属还包括另外9个描述的物种，但没有遗传数据，这使沙门氏菌是否整体而言是单系的。我们的研究将东部CCZ所描述的异生植物种类从8种增加到11种，目前还没有描述另外25种形态型。这些巨大的有孔虫的许多其他物种无疑在深渊中等待发现。