Paranarthrura fortispina Sieg

Larsen, Kim, Bird, Graham & Ota, Mayumi, 2013, The ANDEEP Tanaidacea (Crustacea: Peracarida) revisited I: the family Agathotanaidae Lang, with description of four new species, Zootaxa 3630 (3), pp. 424-444 : 438-439

Paranarthrura fortispina Sieg

Sieg (1986b): 65–68, figs 39–41.

Jóżwiak & BłaŹewicz-Paszkowycz (2011): 33–36, figs 1–2.

Material examined. One manca-II, four non-ovigerous females, ANDEEP I, sample # DZMB-HH 10530, station 42, 59°40.29'S, 57°35.43'W, 3683 m, 27 January 2002, EBS-supra. One ovigerous female, three non-ovigerous females, ANDEEP I, sample # DZMB-HH 10531, station 43, 60°27.12'S, 56°05.10'W, 3961 m, 0 4 February 2002, EBS-epi. One non-ovigerous female, ANDEEP I, sample # DZMB-HH 10532, station 46, no locality data given, 2926 m, 29 January 2002, ATC. One manca-II (with tantulocarid parasite), one non-ovigerous female, one preparatory male, ANDEEP I, sample # DZMB-HH 10533, station 46, 60°38.35'S, 53°57.36'W, 2893 m, 30 January 2002, EBS-epi. Six non-ovigerous females, one preparatory male, one adult male, ANDEEP I, sample # DZMB-HH 10534, station 42, 59°40.29'S, 57°35.43'W, 3683 m, 27 January 2002, EBS-epi. One non-ovigerous female, ANDEEP I, sample # DZMB-HH 10535, station 41, 59°22.24'S, 60°04.06'W, 2375 m, 26 January 2002, EBS-epi. One non-ovigerous female, one male, ANDEEP I, sample # DZMB-HH 10558, station 46, 60°38.35'S, 53°57.36'W, 2893 m, 30 January 2002, EBS-epi. One manca-I, one non-ovigerous female, ANDEEP I, sample # DZMB-HH 10559, station 46, 60°38.35'S, 53°57.36'W, 2893 m, 30 January 2002, EBS-epi. One non-ovigerous female, ANDEEP I, sample # DZMB-HH 10560, station 114, 61°43.54'S, 60°44.20'W, 2914 m, 18 February 2002, EBS-supra. One manca-II, three non-ovigerous females, three males, ANDEEP II, sample # DZMB-HH 10561, station 113, 65°20.15'S, 54°14.35'W, 1123 m, 0 7 March 2002, EBS-epi. One non-ovigerous female, ANDEEP I, sample # DZMB-HH 10562, station 46, 60°38.35'S, 53°57.36'W, 2893 m, 30 January 2002, EBS. Three nonovigerous females, ANDEEP II, sample # DZMB-HH 10433, station 141, 58°25.08'S, 25°00.77'W, 2313 m, 23 March 2002, EBS-epi. Two non-ovigerous females, one male, one manca III, ANDEEP II, sample # DZMB-HH 10430, station 139, 58°26.96'S, 25°01.07'W, 2277 m, 22 March 2002, EBS-epi. One non-ovigerous female, ANDEEP III, sample # DZMB-HH 3226, station 78, 71°09.52'S, 14°00.76'W, 2182 m, 22 February 2005, EBSsupra. One non-ovigerous female, ANDEEP-SYSTCO, sample # DZMB-HH 1602, station 17–11, 70°04.83'S, 03°21.50'W, 2051,4 m, 17 November 2007, EBS-epi. Two non-ovigerous females, ANDEEP-SYSTCO, station 13–16, sample # DZMB-HH 1522, 52°01.98'S, 00°01.12'W, 2997,9 m, 0 6 December 2007 EBS-epi. As there were a large number of specimens, some have been set aside for genetic processing (Araújo-Silva et al. research in progress). Given the distances between the populations, we anticipate the presence of a species complex.

Remarks. This species has very characteristic chelipeds, with a massive dactylus in relation to the fixed finger, and it belongs in that group of generally robust and angular Paranarthrura species that have biarticulate uropod endopods (see below). These records extend the known distribution of P. f o r t i s p i n a further north in the Southern Ocean, away from near the Antarctic coast in the Weddell Sea (1030–1040 m) and Amundsen Sea (489–527 m) (Sieg 1986a, Jóżwiak & Błażewicz-Paszkowycz 2011) as well as greatly increasing the lower depth limit to 3961 m. Unconfirmed records also exist for the New Zealand region, on the Chatham Rise (Bird ined.).