| Summary: | Single-chambered (monothalamous) foraminifera are poorly known compared to their much more familiar multichambered relatives. In this first study of monothalamids in Greenlandic waters, we describe one new genus and two new species belonging to different monothalamid clades from Nuuk fjord system (SW Greenland). Nujappikia idaliensis Gooday & Holzmann gen. nov. sp. nov. (Clade Y) has an approximately cylindrical, bottle-shaped test terminating in a single aperture at the end of a short neck. The flexible, translucent wall is basically organic but with a veneer of very fine agglutinated particles. Bathyallogromia kalaallita Gooday & Holzmann sp. nov. (Clade C) has a spherical to broadly ovate test with a transparent, organic wall and a slightly-produced, mound-like apertural structure. It is larger and genetically distinct from the other two known species of the genus, both from the Southern Ocean. A preliminary survey of the morphological diversity of monothalamds in our samples revealed at least 49 distinct morphospecies. From 19 of these, including the two new species, we obtained DNA sequences that could be assigned to nine clades. Five could be placed in monothalamid genera: Bathysiphon sp, (Clade BM), Micrometula sp. (Clade BM), Psammophaga sp. (Clade E), Hippocrepinella sp. (Clade D) and Crithionina sp. (Clade J). The remaining twelve represented unknown taxa branching in four already established clades (A, C, F, Y) and one new clade. Our results add to growing evidence that these largely overlooked protists are a common and diverse element of meiofaunal assemblages in fjords and other high-latitude settings.
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