Paramblyops brevirostris O.S. Tattersall, 1955

Wittmann, Karl J., 2024, The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae, European Journal of Taxonomy 940, pp. 1-180 : 78-79

Paramblyops brevirostris O.S. Tattersall, 1955

Paramblyops brevirostris O.S. Tattersall, 1955: 112–113 , fig. 25.

Paramblyops brevirostris – Ledoyer 1990: 40, fig. 2b (morphology, Antarctic record with query). — Ariani et al. 1993: table 1 (mineral composition of statoliths). — Wittmann 1996: fig. 1f (Antarctic record). — Brandt et al. 1998: table i (biogeography, endemism). — Murano 2002a: table 1 (morphology, taxonomy). — San Vicente et al. 2006: table 2 (records in Southern Ocean). — San Vicente 2010: 60 (in key to Antarctic species). — Petryashov 2014a: 150, map 10 (biogeography, Antarctic distribution). — Wittmann & Ariani 2019: suppl. (statolith composition, biogeography). — Mees & Meland 2024: AphiaID 226324 (accepted).

Material examined

SOUTHERN OCEAN • 1 imm. (damaged, BL = 14.2 mm); eastern Weddell Abyssal Plain , S of Maud Rise and E of Sanae Canyon, ANDEEP-III station 059-5; 67°29.74ʹ S, 00°01.93ʹ W to 67°29.61ʹ S, 00°02.19ʹ W; depth 4655– 4655 m; 14 Feb. 2005; EBS supranet • 1 ♀ ad. (damaged, BL = 32.2 mm); eastern Weddell Slope , Kapp Norvegia , ANDEEP-III station 081-8; 70°32.02ʹ S, 14°35.05ʹ W to 70°32.19ʹ S, 14°35.13ʹ W; depth 4392– 4385 m; 24 Feb. 2005; EBS epinet • 1 ♂ ad. (damaged, BL = 33.8 mm); same collection data as for preceding except for occurrence in supranet • 1 juv. ( BL = 6.6 mm); Weddell Slope , entrance to Powell Basin , ANDEEP-III station 121-10; 63°37.73ʹ S, 50°38.09ʹ W to 63°37.55ʹ S, 50°38.37ʹ W; depth 2663– 2659 m; 15 Mar. 2005; EBS supranet • 1 juv. (BL = 3.1 mm); Powell Basin , SW continental slope of South Orkney Islands, ANDEEP-III station 150-6; 61°48.70ʹ S, 47°28.04ʹ W to 61°48.57ʹ S, 47°28.19ʹ W; depth 1996– 1993 m; 20 Mar. 2005; EBS epinet .

Morphological notes

Short, broadly subtriangular to about rectangular, apically narrowly rounded rostrum. Disto-lateral edge of eye rudiments forming a short, tooth-like, non-sensory projection; no ocular papilla. Organ of Bellonci in basal position. Antennular trunk with five barbed setae on disto-median lobe, no tooth. Trunk with well-developed antennular bursa, no female antennular lobe, no callynophore.

Type locality and distribution

The type locality is Chollaert Channel, Palmer Archipelago. According to Article 76.1 of the ICZN (1999) the type locality encompasses both detailed localities of the syntypes specified by O.S. Tattersall (1955), namely Discovery stations no. 181 (64°20ʹ S, 63°01ʹ W, depth 160–335 m) and no. 182 (64°21ʹ S, 62°58ʹ W, depth 278–500 m) as long as no lectotype is defined; the coordinates are taken from the Discovery Committee (1929). Combined data by Petryashov (2006) and San Vicente (2010) give the distribution of this species as the South Shetland Islands, Antarctic Peninsula, Weddell Sea and Bellingshausen Sea, 65° S – 72° S, depth 160–529 m, not including the unsure record by Ledoyer (1990) in the Weddell Sea at 74° S at depths of 1996–2012 m. The present records from the Powell Basin and the Weddell Sea at 62° S – 71° S obtained on the sea floor at depths of 1991–4655 m mean a strong vertical range extension. Accordingly, the species appears to be circum-Antarctic with proven range of 62° S – 72° S, 160–4655 m.