биота российских вод японского моря - Materials of Alexey Shipunov

3(4). Truncated apex of telson less than 1/7 as broad as base of 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 of telson more than 1/7 as broad as base of 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 of lateral margin of telson longer than distances betweentheir bases, thereby seeming appressed to each other (pl. XI, fig. 6). Tergites ofdistal segment of thorax and segments 1–5 of abdomen with 2–3 shallow transversefurrows (pl. XI, fig. 3). (Apex of telson with two pairs of spines; outer pairtwice as long as inner one ............................................... 3. N. czerniawskii (p. 56)6(1). Apex of telson rounded (pl. XII, figs. 5, 6). (Spines on distal third of lateral marginof telson longer than distances between them, thereby seeming appressed toeach other. Apex of telson with 2–3 pairs of equal spines. Tergites of distal segmentof 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 marginof carapace with rectangular rostral plate, having rounded distolateral corners.Carpo-propodus of each of thoracopods 5–8 consists of 7–10 (in juveniles) to 19–21subjoints. Exopod of male fourth pleopods 1.5–2.7 times as long as endopod; basal(proximal) segment of exopod 3.7–8.5 times longer than distal one. Small lobe situatedon ventral side of endopod of 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 of spines on distal third of lateral margin less than distances betweenthem; apex armed with 2 pairs of spines: inner spines 3–5 times shorter thanouter ones, the latter usually longer than longest spines on lateral margin. Maximumlength of females 42.1 mm, of males 39.0 mm.Distribution. N. rayii is a Pacific subtropical-boreal species. It is distributedfrom San-Francisco (California) and Tianjin (Gulf of Pohai) to Beechey Point (northerncoast of Alaska) and the Long Strait. In the Sea of 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 of 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 breedingof this species in the Sea of Japan.55