Gooday Andrew J, Holzmann Maria, Schwarzgruber Elsa, Cedhagen Tomas, Pawlowski Jan
National Oceanography Centre, European Way, Southampton SO14 3ZH, UK; Life Sciences Department, Natural History Museum, Cromwell Road, London SW7 5BD, UK.
Department of Genetics and Evolution, University of Geneva, Quai Ernest Ansermet 30, 1211 Geneva 4, Switzerland.
Eur J Protistol. 2022 Oct;86:125932. doi: 10.1016/j.ejop.2022.125932. Epub 2022 Oct 17.
Single-chambered (monothalamous) foraminifera are poorly known compared to their multichambered relatives. In this first study of monothalamids from Greenland, we describe one new genus and two new species belonging to different clades from the Nuuk fjord system. Nujappikia idaliae Gooday & Holzmann gen. nov. sp. nov. (Clade Y) has a bottle-shaped test terminating in a single aperture located on a short neck. The flexible wall is basically organic but with a very fine agglutinated veneer. Bathyallogromia kalaallita Gooday & Holzmann sp. nov. (Clade C) has a broadly ovate test with an organic wall and a mound-like apertural structure. It is larger and genetically distinct from the two other Bathyallogromia species, both from the Southern Ocean. A survey of the morphological diversity of monothalamids in our samples revealed 49 morphospecies, of which 19, including the two new species, yielded DNA sequences. Five were assigned to the genera Bathysiphon, (Clade BM), Micrometula. (Clade BM), Psammophaga. (Clade E), Hippocrepinella (Clade D) and Crithionina (Clade J). The remaining twelve represented unknown taxa branching in clades A, C, F, and Y and one new clade. Our results add to growing evidence that monothalamids are common and diverse in fjords and other high-latitude settings.
与多室有孔虫相比，单室（单房）有孔虫的相关研究较少。在这项对格陵兰岛单房有孔虫的首次研究中，我们描述了一个新属和两个新物种，它们属于努克峡湾系统中不同的进化枝。新属新种伊达利亚努贾皮基有孔虫（进化枝Y）的壳体呈瓶状，末端有一个位于短颈上的单一开口。其柔韧的壁基本上是有机的，但有一层非常细的凝集薄片。新种卡拉利特深海全壁有孔虫（进化枝C）的壳体大致呈卵形，壁为有机质，有一个丘状的开口结构。它比另外两种同样来自南大洋的深海全壁有孔虫物种更大，且在基因上有所不同。对我们样本中单房有孔虫形态多样性的调查揭示了49个形态种，其中19个，包括这两个新物种，获得了DNA序列。五个被归入深海管有孔虫属（进化枝BM）、微室有孔虫属（进化枝BM）、沙食有孔虫属（进化枝E）、海马有孔虫属（进化枝D）和克里西奥尼纳有孔虫属（进化枝J）。其余十二个代表在进化枝A、C、F和Y以及一个新进化枝中分支的未知分类单元。我们的结果进一步证明了单房有孔虫在峡湾和其他高纬度环境中很常见且种类多样。
