(Figs 1 & 2)
Scolecolepides arctius Chamberlin, 1920: 17–18, pl. III, figs 5–7, pl. IV, fig. 1.
Marenzelleria arctia: Sikorski & Buzhinskaya 1998: 1115−1118, figs 2, 3. Stolyarov 1994: 67. Burkovsky et al. 1995: 69. Burkovsky & Stolyarov 1995: 36. Sikorski & Buzhinskaya 1998 (Part.): 1115−1118, figs 2, 3. Sikorski 2001: 302−303, textfigs 1−6. Chertoprood et al. 2004: 904−906. Sikorski & Bick 2004: 268−271, figs 2D, F, 3D, 6, 7A−I. Stolyarov & Burkovsky 2004: 422. Bastrop & Blank 2006: 1197–1199. Blank et al. 2008: 129–139. Blank & Bastrop 2009: 313–318. Maximov 2010: 19–31; 2015: 300–310. Kocheshkova & Ezhova 2018: 219–227.
Laonice annenkovae Zachs, 1925: 3. Uschakov 1939: 82; 1950: 200; 1955: 265. Fide Sikorski & Buzhinskaya 1998: 1115.
Marenzelleria wireni: Annenkova 1932: 176. Vinogradov 1947: 131−132. Sikorski et al. 1988 (Part.): 835−837, fig. 4a−k. Fide Sikorski & Bick 2004: 268. Not Augener 1913.
Remarks. Sikorski & Buzhinskaya (1998) transferred Scolecolepides arctius to the genus Marenzelleria and redescribed the species based on the type material (paratypes MCZ ANNb-2194, 2195). They also synonymized Laonice annenkovae Zachs, 1925, from Kola Bay (Barents Sea, Russia) with M. arctia and reported the latter species from the Barents, White, Kara, East Siberian and Bering seas of Russia. Bastrop & Blank (2006) for the first time reported M. arctia from the Baltic Sea based on the results of molecular analysis of specimens collected from the Gulf of Bothnia and around the Isle of Askö (Sweden) in 2005. Later, the species was reported from the Gulf of Finland (Finland: Blank et al. 2008; Russia: Maximov 2010, 2015), and south-eastern part of the Baltic Sea (Russia: Kocheshkova & Ezhova 2018).
Marenzelleria arctia has not been reported from North America since Chamberlin’s original description. Complete information about type material of M. arctia from the Beaufort Sea, Alaska, is given in Table S2.
Distribution in North America. Beaufort Sea, Alaska, USA (Fig. 2).