Abstract
During two IceAGE expeditions, a large collection of Tanaidacea was gathered from the shelf down to the slope (213−2750 m) in six areas off Iceland—the Irminger Basin, the Iceland Basin, the Norwegian Sea, the Denmark Strait, the Iceland-Faroe Ridge, and the Norwegian Channel. In this collection, members of the family Pseudotanaidae were most numerous component. We examined 40 samples collected with different gears (e.g., EBS, VVG. GKG), in which 323 pseudotanaid individuals were counted and covered a total depth from 213.9 to 2746.4 m. Morphological identification of the material has revealed the presence of five species: Akanthinotanais cf. longipes, Mystriocentrus biho sp. n. Pseudotanais misericorde sp. n., P. svavarssoni sp. n., and P. sigrunis sp. n. The description of the four new species has been presented in the paper and a rank of the subgenus Akanthinotanais is elevated to a genus rank. A large group of morphologically almost identical specimens, similar with P. svavarssoni sp. n. from a wide depth range and from various areas off Iceland was discriminated to species by applying morphometric methods; one distinct species (P. svavarssoni sp. n.) and complex of presumably cryptic species the species was discovered. Based on current data and literature records, similarity among fauna of Pseudotanaidae was assessed with applying Bray–Curtis formula. As results, potential zoogeographic regions in the North Atlantic have been distinguished.
Highlights
Iceland is located at the junction of the Mid-Atlantic Ridge and Greenland–Scotland Ridge (Logemann et al 2013.) The submarine ridges play an essential role in the oceanic circulation and distribution of water masses, and in the distribution of marine fauna (Asthorsson et al 2007; Brix and Svavarsson 2010; Schnurr et al 2014)
principal component analysis (PCA) run with the seven morphometric characters initially identified as significantly discriminating (Table 3) was applied to the most numerous pseudotanaid species (Pseudotanais svavarssoni sp. n.) and resulted in the first five PCs accounting for 90% of the total variation
The Icelandic marine Animals Genetic and Ecology (IceAGE) collection represented by 323 specimens was dominated by Pseudotanais svavarssoni sp. n. which accounted for 57% of the specimens examined, followed by Pseudotanais sigrunis sp. n., Pseudotanais misericorde sp. n., Mystriocentrus biho sp. n., and Akanthinotanais cf. longipes, which made up 5.5, 1.8, 1.2, and 0.3% of all the identified specimens, respectively
Summary
Iceland is located at the junction of the Mid-Atlantic Ridge and Greenland–Scotland Ridge (Logemann et al 2013.) The submarine ridges play an essential role in the oceanic circulation and distribution of water masses, and in the distribution of marine fauna (Asthorsson et al 2007; Brix and Svavarsson 2010; Schnurr et al 2014). This article is registered in ZooBank under: urn:lsid:zoobank.org:pub: F65EDFAB-7032-44B2-9484-06EDD56B87D8. This article is part of the Topical Collection on Biodiversity of Icelandic Waters by Karin Meißner, Saskia Brix, Ken M.
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