биота российских вод японского моря - Materials of Alexey Shipunov
биота российских вод японского моря - Materials of Alexey Shipunov
биота российских вод японского моря - Materials of Alexey Shipunov
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3(4). Truncated apex <strong>of</strong> telson less than 1/7 as broad as base <strong>of</strong> telson (pl. IX, fig. 7).Rostral plate rectangular, with rounded distal corners (pl. IX, fig. 3) ........ ................................................................................................................. 1. N. rayii (p. 55)4(3). Truncated apex <strong>of</strong> telson more than 1/7 as broad as base <strong>of</strong> telson (pl. X, fig. 6).Rostral plate triangular, with rounded or, rarer, pointed apex (pl. X, figs. 2, 3) ........................................................................................... 2. N. awatschensis (p. 56)5(2). Spines on distal third <strong>of</strong> lateral margin <strong>of</strong> telson longer than distances betweentheir bases, thereby seeming appressed to each other (pl. XI, fig. 6). Tergites <strong>of</strong>distal segment <strong>of</strong> thorax and segments 1–5 <strong>of</strong> abdomen with 2–3 shallow transversefurrows (pl. XI, fig. 3). (Apex <strong>of</strong> telson with two pairs <strong>of</strong> spines; outer pairtwice as long as inner one ............................................... 3. N. czerniawskii (p. 56)6(1). Apex <strong>of</strong> telson rounded (pl. XII, figs. 5, 6). (Spines on distal third <strong>of</strong> lateral margin<strong>of</strong> telson longer than distances between them, thereby seeming appressed toeach other. Apex <strong>of</strong> telson with 2–3 pairs <strong>of</strong> equal spines. Tergites <strong>of</strong> distal segment<strong>of</strong> thorax and all abdominal segments smooth, without furrows) ................................................................................................................ 4. N. mirabilis (p. 57)1. Neomysis rayii (Murdoch, 1885)(Pl. I, figs. 1, 2; IX, figs. 1–7)Murdoch, 1885: 519 (Mysis rayii); Holmes, 1900: 223 (Neomysis franciscorum); Zimmer,1904: 470 (Neomysis rayii); Derjavin, 1913: 198 (Neomysis toion); Schmitt, 1919: 6(Neomysis franciscana).Description. Antennal scale long, 9.5–13.6 times as long as broad. Anterior margin<strong>of</strong> carapace with rectangular rostral plate, having rounded distolateral corners.Carpo-propodus <strong>of</strong> each <strong>of</strong> thoracopods 5–8 consists <strong>of</strong> 7–10 (in juveniles) to 19–21subjoints. Exopod <strong>of</strong> male fourth pleopods 1.5–2.7 times as long as endopod; basal(proximal) segment <strong>of</strong> exopod 3.7–8.5 times longer than distal one. Small lobe situatedon ventral side <strong>of</strong> endopod <strong>of</strong> uropod between statocyst and inner margin,armed with 17–22 (in juveniles) to 56 spines. Telson triangular, with narrow truncatedapex: apex width 7.5–12 times less than base width; telson 2.6–3.3 times as long asbroad at base; lengths <strong>of</strong> spines on distal third <strong>of</strong> lateral margin less than distances betweenthem; apex armed with 2 pairs <strong>of</strong> spines: inner spines 3–5 times shorter thanouter ones, the latter usually longer than longest spines on lateral margin. Maximumlength <strong>of</strong> females 42.1 mm, <strong>of</strong> males 39.0 mm.Distribution. N. rayii is a Pacific subtropical-boreal species. It is distributedfrom San-Francisco (California) and Tianjin (Gulf <strong>of</strong> Pohai) to Beechey Point (northerncoast <strong>of</strong> Alaska) and the Long Strait. In the Sea <strong>of</strong> Japan it is found in the TatarStrait and in Possjet Bay.Habitat and breeding. N. rayii is a sublittoral species, with a depth range from 0to 79 m, mostly to 50 m, in the Sea <strong>of</strong> Japan from 2 to 78 m. It is found in waters witha temperature from -1.7° to +25°C and a salinity from 15 to 34.3‰, over sand andmuddy sand, rarer over boulders, pebbles, or silt. There are no records for the breeding<strong>of</strong> this species in the Sea <strong>of</strong> Japan.55