Nansenia boreacrassicauda Poulsen, new species

Nansenia boreacrassicauda Poulsen, new species

Figs. 1 A–D; Table 1

Type materials. Holotype. ZMUC P192172, 232.0 mm SL (65°32'N, 30°57'W).

Paratypes. ZMH 122532 (ISH 174-1986), 197.2 mm SL (57°46'N, 18°5'W); ZMH 120802 (ISH 968-1982), 265.2 mm SL (49°48'N, 25°54'W); ZMH 122530 (ISH 264-1986), 226.0 mm SL (57°34'N, 18°12'W); ZMH 122553 (ISH 201-1986), 230.8 mm SL (57°43'N, 17°40'W); ZMH 120833 (ISH 967-1982), 268.0 mm SL (43°42'N, 28°27'W).

Comparative materials. Nansenia ardesiaca. AMS I.22817-025, 129.3 mm SL (Indian Ocean, off the Australian Northwest Shelf); BSKU 28403, 134.5 mm SL (Okinawa Through, Okinawa, Japan).

Nansenia cf. ardesiaca (adipose fin not pigmented). AMS I.22817-025, 124.2 mm SL (Indian Ocean, off the Australian Northwest Shelf); BSKU 13127, 155.0 mm SL (Northwestern Pacific Ocean, off Kochi, Japan); MCZ 159274, 82.6 mm SL (31°26'N, 16°28'W).

Nansenia atlantica. ZMH 103928 (ISH 335-1966), 90.8 mm SL (10°46'N, 23°54'W); ZMH 105441 (ISH 457- 1968), 110.8 mm SL (16°14'N, 22°24'E); ZMH 105453 (ISH 686-1968), 152.0 mm SL (08°21'N, 24°10'W); ZMH 105485 (ISH 1311-1968), 169.0 mm SL (16°08'N, 22°22'W); AMS I.20066-072, 81.1 mm SL (off Brush Island, New South Wales, Australia).

Nansenia iberica (paratype). UAB 1985.6.14, 237.0 mm SL (Northwestern Mediterranean Ocean, off Blanes, Spain).

Nansenia oblita. MCZ 66132(2), 43.6 and 77.3 mm SL (37°01'N, 00°05'W); MCZ 66134, 87.8 mm SL (39°57'N, 06°43'E).

Nansenia cf. oblita (adipose base pigmented). MCZ 66133, 59.3 mm SL (14°30'N, 21°47'W).

Nansenia cf. pelagica (vertebrae 46). ZMH 120958 (ISH 465-1982), 106.5 mm SL (45°24'N, 27°41'W).

Nansenia tenera. MCZ 66016, 96.4 mm SL (49°53'N, 39°18'W).

The complete mitochondrial DNA sequences (mitogenomes), except a part of the control region, were determined for the holotype of N. boreacrassicauda sp. n. as well as a southeast Greenland specimen (64°57'N, 34°27'W) of Argentina silus (ZMUC P192172 and P192171, respectively). They were determined using conventional lab-methods employing DNA extraction (Qiagen Puregene kit), long-amplification (LA) PCR of the entire mitochondrial genome (Cheng et al. 1994), nested short PCR using the LA PCR product as template, direct cycle-sequencing with dye-labeled terminators and Sanger Sequencing on automated DNA sequencers (Applied Biosystems). Lab-work and sequencing were carried out at the Ocean Research Institute (ORI), University of Tokyo, and at the Biodiversity Laboratory and Sequencing Facility at the University of Bergen (UIB). Universal fish primers covering a range of teleost fishes were employed (e.g. Miya & Nishida 1999; Byrkjedal et al. 2011).