биота российских вод японского моря - Materials of Alexey Shipunov

KEY TO THE SPECIES OF THE GENUS METERYTHROPS1(2). Eyes large, twice as long as first segment of antennular peduncle, extend beyondlateral margins of carapace in dorsal view (pl. IV, fig. 1) ...... 1. M. robusta (p. 48)2(1). Eyes small, almost equal in length to first segment of antennular peduncle, donot extend beyond lateral margins of carapace in dorsal view (pl. IV, fig. 5) ........................................................................................... 2. M. microphthalma (p. 48)1. Meterythrops robusta Smith, 1879(Pl. IV, figs. 1–4)Smith, 1879: 93 (Meterythrops robusta); G.O. Sars, 1879: 98 (Parerythrops robusta).Description. Eyes large, spherical, 2 times as long as first segment of antennularpeduncle; extend beyond lateral margins of carapace in dorsal view. Antennal scaleusually lanceolate, rarer diamond-shaped, 1.8–4 times as long as broad (usually 2–3times). Distal part of scale, extending beyond base of spine on outer margin, comprises0.28 to 0.5 of whole length of antennal scale (usually about 1/3). Maximum lengthof females 21.0 mm, maximum length of males 24.0 mm (in the Tatar Strait – correspondingly10.2 mm and 13.6 mm).Distribution. M. robusta is an amphiboreal-arctic species. In the Atlantic Oceanand in the Arctic it is known from the eastern coast of the USA (40° N) and southernNorway to Greenland (69° N near the western coast), the eastern Murman Coast, andalong the continental slope of the Arctic basin to the East Siberian Sea (78°06.3′N,154°15.7′E). In the Pacific Ocean it is distributed from the Strait of Juan de Fuca, thesouth-western coast of Sakhalin Island and the eastern coast of Iturup Island (Kurils)to the Bering Sea (60° N).In the Sea of Japan it has been recorded only in the Tatar Strait off the southwesterncoast of Sakhalin, near the villages of Kalinino and Antonovo.Habitat and breeding. M. robusta occurs in the sublittoral and upper bathyalzones, between 17 and 620 m of depth: it is common in the Pacific in depths from 100to 200 m, and in the Tatar Strait it is found in depths from 60 to 125 m. It occurs inwaters with a temperature from -1.8° to +15°C and a salinity of 29.5–35‰, usuallyover sandy and silty bottoms, sometimes mixed with stones. There are no records forthe breeding of this species in the Sea of Japan.2. Meterythrops microphthalma Tattersall, 1951(Pl. IV, figs. 5–7)Tattersall, 1951: 113–116 (Meterythrops microphthalma); Taniguchi, 1969: 47–48 (Meterythropsrobusta).Description. Eyes relatively small, almost equal in length to first segment of antennularpeduncle, do not extend beyond lateral margins of carapace in dorsal view.Antennal scale diamond-shaped, 2.1–3.8 times as long as broad. Distal part of scale,extending beyond base of robust spine on outer margin, comprises 1/3–1/2 of wholelength of antennal scale (usually about 2/5). Maximum body length all over area ofdistribution, as well as in Sea of Japan: of females 23.5 mm, of males 24.6 mm.48