Paramblyops Holt & Tattersall, 1905

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 : 77-78

Genus Paramblyops Holt & Tattersall, 1905

Paramblyops Holt & Tattersall, 1905: 124 , pl. xxi.

Paramblyops – Tattersall & Tattersall 1951: 255 (diagnosis). — O.S. Tattersall 1955: 111 (short description). — Birstein & Tchindonova 1970: 288, figs 7–8 (species description). — Mauchline 1980: 27–28 (taxonomy, in key to genera). — Murano 1981: 288–289 (description, key to species); 2002a: 35, table 1 (diagnosis, definition of species groups). — Tchindonova 1981: 26 (deep sea, distribution); 1993: 156–157, fig. 2 (partim, vertical distribution). — San Vicente 2010: 17, 47 (short diagnosis, Antarctic); 2017: table 2 (geographical and bathymetric distribution). — Petryashov 2014b: 188 (distribution). — Wittmann et al. 2014: 336 (taxonomy). — Petryashov & Frutos 2017: 404 (in key to genera). — Mees & Meland 2024: AphiaID 119891 (accepted).

Type species

Paramblyops rostrata Holt & Tattersall, 1905 , by original designation according to ICZN (1999).

Diagnosis

Based on adults of both sexes. Eye rudiments without stalk, separate, not connected by membranous integument, positioned laterally, each reduced to roughly triangular or rectangular pads with only disto-lateral edge produced into a tooth-like non-sensory projection, no visual elements, no ocular papilla. Antennular trunk with three segments separated by transverse articulations; basal segment without ventral carina. Antennal scale not subdivided, bare portion of lateral margin distally ending in a single, strong tooth; mesial margin setose all along. Antennal peduncle with three segments lined in a single plane. Thoracomeres and pleomeres normal. Thoracic endopod 2 not prehensile. Endopods 3–8, as far as known, with oblique articulation between carpus and propodus. Female pleopods representing setose rods with residual differentiation of pseudobranchial lobe. Male pleopods biramous, with well-developed sympod and multi-segmented exopod. Endopod 1 short, unsegmented; endopods 2–5 long, multi-segmented; all endopods with small, setose pseudobranchial lobe; endopod 4 with modified setae in certain species. Uropods setose all around, without any or with a single spine below statocyst. Telson trapeziform, distally converging, no lateral constriction, terminally truncate without any or with small median indentation. Lateral margins all along or only distally with densely set spines. Terminal margin mesially with small spines plus 0–3 setae, in any case altogether flanked by large spines.

Species included (7 species acknowledged)

— P. brevirostris O.S. Tattersall, 1955 from the Southern Ocean: circum-Antarctic, 62– 72° S, depth 160–4655 m (O.S. Tattersall 1955; Petryashov 2006, 2014b; San Vicente 2010; present paper: 78)

— P. hamatilis Fukuoka, 2009 from the NW Pacific, E of Japan, 39– 43° N, 141– 143° E, depth 1535– 2137 m ( Fukuoka 2009)

— P. macrops Murano, 2007 from the E Indian Ocean: Timor Sea, 13° S, 123° E, depth 535–547 m ( Murano 2007)

— P. petrescui sp. nov. from the Southern Ocean: NW Weddell Sea, 65° S, 52° W, depth 3049–3050 m

— P. rostratus Holt & Tattersall, 1905 from the E Atlantic ( Angola Basin, Morocco, off Ireland, Faroes, Iceland), NW Atlantic ( U.S. east coast) and Mediterranean (Catalan Sea, Tyrrhenian Sea), 16° S – 64° N, 14° E – 72° W, depth 280–5434 m ( Colosi 1929; W.M. Tattersall 1951; Tattersall & Tattersall 1951; Lagardère 1972; Cartes & Sorbe 1995; San Vicente 2017; Wittmann 2020; Astthorsson & Brattegard 2022)

— P. spatulicaudus Murano, 2002 from the Indo-Pacific: Sulu Sea, 8° N, 122° E, depth 4890 m ( Murano 2002a)

— P. tenuicaudus Murano, 2002 , from the Indo-Pacific: Sulu Sea, 8° N, 118° E, depth 495–500 m ( Murano 2002a)

Note. As concluded in the ‘Discussion’ below, P. bidigitatus W.M. Tattersall, 1911 and P. japonicus Murano, 1981 are not included here but transferred to Amphiakrops gen. nov. In addition, P. globorostris Birstein & Tchindonova, 1970 is transferred to Chelamblyops gen. nov.