Department of Genetics and Evolution, University of Geneva, Quai Ernest Ansermet 30, 1211 Geneva 4, Switzerland.
National Oceanography Centre, European Way, Southampton SO14 3ZH, UK; Life Sciences Department, Natural History Museum, Cromwell Road, London SW7 5BD, UK.
Eur J Protistol. 2022 Aug;85:125909. doi: 10.1016/j.ejop.2022.125909. Epub 2022 Jul 8.
Based on molecular and morphological data, we describe three new genera and four new species of monothalamids from the sublittoral zone (21-250 m) in South Georgia fjords that belong to different monothalamid clades. Limaxia alba gen. nov. sp. nov. (Clade A) has an elongate, subcylindrical test, 359-688 µm long, with some detritus attached to the organic wall. Hilla argentea gen. nov. sp. nov. (Clade Y) has a cylindrical, finely agglutinated test, 535-755 µm long. Pseudoconqueria lenticularis gen. nov. sp. nov. branches separately. It has a spindle-shaped, finely agglutinated test, 280-574 µm long. Bathyallogromia olivacea sp. nov. (Clade C) has an ovate organic-walled test, 369-433 µm long. We present the first genetic data on two monothalamid species originally described from South Georgia, Hippocrepinella alba (Clade C) and Hippocrepinella hirudinea (Clade D), as well as a single sequence for C. delacai (Clade J) originally described from McMurdo Sound, Antarctica. In addition, we report nine undescribed species branching in six different monothalamid clades (A, B, BM, C, J, Y), eight of them sampled around South Georgia and one collected from the Falkland Islands near Stanley.
基于分子和形态学数据，我们描述了来自南乔治亚峡湾浅海（21-250 米）的三个新的单室贝类属和四个新种，它们属于不同的单室贝类进化枝。白贝属（新属）（A 进化枝）具有细长的、近圆柱形的壳，长 359-688µm，壳上附有一些碎屑。银海扇属（新属）（Y 进化枝）具有圆柱形、细粒粘结的壳，长 535-755µm。假沟贝属（新属）（新种）分支分开。它具有纺锤形、细粒粘结的壳，长 280-574µm。深海油球贝属（新种）（C 进化枝）具有卵形有机壁壳，长 369-433µm。我们首次提供了两个最初在南乔治亚描述的单室贝类物种的遗传数据，即 Hippocrepinella alba（C 进化枝）和 Hippocrepinella hirudinea（D 进化枝），以及一个来自南极洲麦克默多海峡的 C. delacai（J 进化枝）的单序列。此外，我们报告了九个未描述的物种，它们分支在六个不同的单室贝类进化枝（A、B、BM、C、J、Y）中，其中八个在南乔治亚附近采样，一个在斯坦利附近的福克兰群岛采集。
