биота российских вод японского моря - Materials of Alexey Shipunov

Distribution. M. microphthalma is a West Pacific widespread boreal species. Itis distributed from Sagami Bay (the eastern coast of Honshu Island) and the southernSea of Japan to the northern Bering Sea (60° N, near Olyutorsky Cape).Habitat and breeding. M. microphthalma inhabits the mesopelagic and bathypelagiczones; during vertical migrations it can also penetrate the epipelagic zone. It isfound from 10–26 m to a depth of 2800 m; at night it usually occurs at 800–200 m, inthe daytime – at 1100–600 m. It is found in waters with a temperature from +0.2° to+5°C and a salinity of 33–34.4‰. Females with embryos were recorded in the Sea ofJapan from January till February and from August till October. The number of embryosin each female varies between 8 and 24. M. microphthalma is a most abundantmeso-bathypelagic mysid species in the Sea of Japan and Sea of Okhotsk.2. Tribe Mysini Hansen, 1910Carpus and propodus of thoracopods 3–8 fused, with secondary division into subjoints,without oblique articulation (except for genus Inusitatomysis). Forms of antennalscale and telson greatly vary: in genera from Russian waters of Sea of Japan outermargin of antennal scale setose and without spines, or (in genus Inusitatomysis) sawtoothedand without setae; telson entire, not cleft on apex, cleft only in genus Inusitatomysis.In males at least pleopod 2 rudimentary and uniramous. Exopod of malepleopod 4 elongate and modified, except for species of genus Inusitatomysis, whichhave endopod elongate and exopod rudimentary.The tribe Mysini is comprised of 48 genera, and the mysids of nine genera occurin the northern part of the Sea of Japan, namely: Inusitatomysis, Xenacanthomysis,Stilomysis, Disacanthomysis, Neomysis, Boreoacanthomysis, Hemiacanthomysis, Exacanthomysis,and Paracanthomysis.KEY TO THE GENERA OF THE TRIBE MYSINI1(2). Outer margin of antennal scale saw-toothed, without setae (pl. V, fig. 3). Telsonwith V-shaped cleft on apex (pl. V, fig. 8) ....................... 1. Inusitatomysis (p. 50)2(1). Outer margin of antennal scale with setae along its full length, lacks spines(pl. VI, fig. 3; VII, fig. 3; IX, fig. 1). Telson entire, not cleft (pl. VI, fig. 7; IX,fig. 7; XII, figs. 5, 6; XIV, fig. 5).3(4). Second and third segments of antennular peduncle in males with spiny knob-likeprocesses; inner flagellum of antennule with row of striated shell-like processes(pl. VI, fig. 2). Exopod of male pleopod 4 relatively robust, strongly curved atbase, one- to three-segmented, usually one-segmented with one or two indicationsof suture (pl. VI, fig. 4). (Eyes cylindrical [pl. VI, fig. 1]. Telson elongate,linguiform; its apex with row of subequal spines, shorter or equal in length tolarge spines of lateral margin of telson, usually much shorter [pl. VI, fig. 7]) ........................................................................................... 2. Xenacanthomysis (p. 51)4(3). Male antennule has ordinary shape: without spiny knob-like processes on secondand third segments of peduncle and without striated shell-like processes on innerflagellum (pl. VII, fig. 2; XVI, fig. 2). Exopod of male pleopod 4 relatively thin,slender, always straight at base, 1–5-segmented (pl. VII, fig. 5; VIII, fig. 2; IX,fig. 5; XVI, fig. 5).49