Leptognathia polita : Hansen (1913) : 96 Leptognathia polita : Just (1970) : 24 Leptognathia polita : Holdich and Bird (1985) : 444 Leptognathioides potens Bird and Holdich, 1984 Leptognathioides polita : Bird and Holdich (1984) : 292 Tanaidacea (Crustacea: Peracarida) of the North-east Atlantic: the genera Leptognathioides and Portaratrum of the ‘ Atlantic Margin’ Bird, Graham J. Journal of Natural History 2014 2014-04-23 48 29 - 30 1771 1815 3TPZJ (Hansen 1913) Hansen 1913 [406,841,280,304] Malacostraca Leptognathioides Animalia Tanaidacea 6 1776 Arthropoda species polita      Leptognathia polita: Just (1970): 24   Non   Leptognathia polita: Holdich and Bird (1985): 444, Table 1, =  Leptognathioides potens Bird and Holdich, 1984     Leptognathioides polita: Bird and Holdich (1984): 292, figs 4–5    Diagnosis Female: with pereonites all shorter than broad. Cheliped propodus without obvious step process on inferior margin, fixed finger with triangular tooth on incisive margin. Pleopod endopod with six distolateral setae, exopod lateral margin with proximal seta and nine distal setae. Uropod exopod one-segmented. Preparatory male: pleopod rami broader than in female, endopod with one distomedial and eight distolateral setae; exopod with proximolateral seta and distolateral fringe of ten setae.    Material examined[for morphometrics]  One non-ovigerous (non-ov.) ♀, two preparatory (prep.) ♂♂, AFEN 1998 Stn 54503#3; three non-ov. ♀♀, one prep. ♂, AFEN 1998 Stn 54518#1; one manca-II, AFEN 1998 Stn 54521#1/3; two non-ov. ♀♀, AFEN 1998 Stn 54549#2; one non-ov. ♀(?), AFEN 1998 Stn 54552#1; three manca-II, one manca-III, four non-ov. ♀♀, one ov. ♀, one prep. ♂, AFEN 1998 Stn 54552#4; one non-ov. ♀, AFEN 1998 Stn 54553#2; one non-ov. ♀, AFEN 1998 Stn 54554#3; two non-ov. ♀♀, one prep. ♂, BIOFAR Stn 263; one prep. ♂, BIOFAR Stn 264; three manca-III, 102 non-ov. ♀♀, 13 post-ov. ♀♀, 50 prep. ♂♂, BIOFAR Stn 380; seven non-ov. ♀♀, five prep. ♂♂, BIOFAR Stn 381; one non-ov. ♀, BIOFAR Stn 417; one manca-III, two non-ov. ♀♀, BIOICEStn 2021; one manca-III, five non-ov. ♀♀, one ov. ♀, BIOICEStn 2023; one non-ov. ♀, BIOICEStn 2024; one non-ov. ♀, BIOICEStn 2025; three manca-III, 17 non-ov. ♀♀, one ov. ♀, two post-ov. ♀♀, five prep. ♂♂, BIOICEStn 2030; one prep. ♂, BIOICEStn 2362; three manca-II, four manca-III, 58 non-ov. ♀♀, three ov. ♀♀, 19 prep. ♂♂, BIOICEStn 2673; one non-ov. ♀, BIOICEStn 2947; one non-ov. ♀, one post-ov. ♀, two prep. ♂♂, one fragment, BIOICEStn 3115; one manca-II, four non-ov. ♀♀, four prep. ♂♂, BIOICEStn 3124; 97 non-ov. ♀♀, nine post-ov. ♀♀, nine prep. ♂♂, BIOICEStn 3249; five non-ov. ♀♀, one ov. ♀, BIOICEStn 10722 (data unknown, possible mislabelling).    Distribution in main study area   Representedby 88 records from AFEN area: three from the West Shetland Slope  367–554 m, two from Faroe Bank Channel 862–1011 m, and 83 from the Faroe- Shetland Channel  602–1408 m.  By31 records from BIOFAR: seven from Faroe Plateau  225–497 m, four from the Faroe-Norway Rise 507–808 m, seven from the Faroe-Shetland Channel 509–1150 m, five from the Iceland-Faroes Rise(N, Faroes)  503–804 m, four from the Iceland-Faroes Rise(S, Faroes)  509–894 m, two from the Norwegian Basin 1022–1261 m, and one each from the Faroe Bank Channeland Wyville-Thomson Ridgeat  1038 mand 732 m respectively. By89 records from BIOICE: eleven from Denmark Strait  203–1012 m; three from Greenland-Iceland Rise 213–231 m; nine from Iceland ShelfE, N, NE, NW and W  148–196 m; 15 from Iceland Plateau  225–1008 m; 21 from Iceland-Faroes Rise(N, Iceland)  215–996 m; six from Iceland-Faroes Rise(S, Iceland)  350–550 m; five from Irminger Basin 240–305 m; and 19 from Kolbeinsey Ridge 203– 905 m. Overall depth range: 148–1408 m; overall temperature range –0.82°C to 6.5°C, almost evenly split between positive and negative temperatures ( n= 84).   Distribution elsewhere East Greenland, Jørgen Brønlund Fjord, 40–105 m( Just 1970).    Remarks Additional figures shown here supplement or correct some given by Bird and Holdich (1984), and include those for ‘preparatory males’. As they were omitted in that paper, the size ranges of the different life-stages are: manca-II 1.2–1.5 mm; manca-III 1.6– 2.1 mm; non-ovigerous female 1.8–3.9 mm; ovigerous female 2.7–3.5 mm; postovigerous female 2.6–3.7; preparatory male 2.5–3.4 mm. The maxilliped structure ( Figure 1A) is close to what was drawn by Bird and Holdich and very similar to that of new species described below, with the bases having an anterior projection over the endites and the latter each with a distal lobe on the oral-surface bearing a seta. Some individuals have seemingly bisegmented uropods ( Figure 1E) but these are not well-defined as in the new species described below. The preparatory male is very similar in most respects to the female but has thicker antennules ( Figure 1C) and more well-developed pleopods ( Figure 1D). This species is widespread and occasionally abundant in the shelf–bathyal zone of (largely) the cold-water region between Icelandand the Shetlands ( Figure 12) and is a good ‘marker’ for this water mass where it impinges on the Shetlandand Faroe slopes within the Faroe-Shetland Channel (e.g. Bett 2000; Bird 2001). Here there is a rapid turnover between 500–600 mdepth of the tanaidacean fauna, from one typical of the West European shelf and upper slope to one characteristic of the bathyal ‘cold water’ zone, in which  L. politais a significant contributor ( Bird 2001). Nevertheless, this species has a broad thermal tolerance and is one of the few tanaidaceans that apparently straddle the cold–warm water-mass interface. There is also evidence from this distribution of an association with the southern overspill of cold Norwegian Sea water across the Iceland-Faroe Rise. The type(and only) locality recorded by Hansen (1913)was Ingolf Stn 141, north of the Faroes, at 1242 m, with a temperature of –0.6°C. This corresponds to region ‘39, Norwegian Basin’ in Table 1. This species was not recorded by Bodil et al. (2011). BIOICE 6 1776 44 31 13 Represented 461 Slope West 6 1776 1 Shetland Islands United Kingdom 1005 Channel 6 1776 1 By United Kingdom 361 7 1777 Faroe Plateau 6 1776 1 Iceland-Faroes Rise United Kingdom 654 Faroes 7 1777 1 [463,1167,232,256] Iceland-Faroes Rise United Kingdom 701 Faroes 7 1777 1 United Kingdom 0 Wyville-Thomson Ridge Faroe Bank Channel 7 1777 1 BIOICE By Denmark 608 Strait 7 1777 1 Shelf Iceland 172 Iceland 7 1777 1 [391,825,391,415] Plateau Iceland 617 Iceland 7 1777 1 Iceland-Faroes Rise Iceland 606 Iceland 7 1777 1 [502,1117,423,447] Iceland-Faroes Rise Iceland 450 Iceland 7 1777 1