биота российских вод японского моря - Materials of Alexey Shipunov

14(1). Trunk completely or partially segmented.15(18). Trunk completely segmented, all segments separated.16(17). Ocular tubercle conical, eyes situated in middle of it, proboscis relativelyslender, almost cylindrical ....................................... 6. A. segmentata (p. 111)17(16). Ocular tubercle very tall, cylindrical, eyes situated at its top; proboscis oval,swollen medially ............................................................... *A. superba (p. 112)18(15). Trunk not completely segmented, no articulation line between segments 3and 4.19(20). Ocular tubercle tall, cylindrical; two conical tubercles with truncated topsbearing spines situated dorsally on frontal margin of trunk, on ends of lateralprocesses and 1st coxae of legs .................... 7. A. echinata orientalis (p. 113)20(19). Ocular tubercle low, conical, frontal margin smooth, lateral processes bear 2–3tubercles with spines on tops ................................ 8. A. kamtschatica (p. 114)1. Achelia borealis (Schimkewitsch, 1895)(Pl. IX, figs. 1–5)Schimkewitsch, 1895: 36–40, pl. 2, figs. a–b; 1930: 139–144, figs. 34–37 (Ammotheaborealis); Losina-Losinsky, 1933: 57–59, fig. 9 (Ammothea borealis var. japonica); Losina-Losinsky, 1961: 52 (Achelia borealis spp. japonica); Hedgpeth, 1949: 286–287, fig. 41 k–m(Achelia borealis).Description. Trunk elongated, unsegmented, smooth. Cephalic segment small,without tubercles. Lateral processes long, twice as long as broad, separated byintervals, broadening distally; each has small tubercle without spine on anterior distalangle. Proboscis oval, slightly shorter than trunk. Ocular tubercle tall, cylindrical, withflat top, situated near frontal margin; eyes pigmented, placed almost on top. Abdomenalmost 1/5 longer than trunk, swollen in distal half, tapered towards end. Cheliforeslightly longer than half of proboscis; scape cylindrical; chela vestigial, withoutfingers. Palp 8- segmented, longer than proboscis; segment 2 longest; segment 4shorter; other segments short; segments 7 and 8 shortest. Oviger twice as long astrunk; segment 10 bears two compound spines; segments 7 to 9 bear 1–2 simplespines. Legs thin, 6 times longer than trunk; coxa 1 bears tubercle with small spine, astall as 3/4 of coxal length; other segments without tubercles and spines, armed onlywith setae. Tibia 1 longest; propodus almost straight, long, slender, without heel andisolated large spines; smaller spinules scattered over entire surface of sole. Main clawalmost 4 times shorter than propodus; auxiliary claws slightly shorter than main one.Measurements of male: trunk 1.4 mm, proboscis 1.2 mm, chelifore 0.6 mm, palp2.8 mm, 2nd leg 8.2 mm, propodus 0.9 mm, main claw 0.2 mm.Geographical distribution. A. borealis is a boreal-arctic species. The subspeciesA. borealis japonica (Losina-Losinsky) has been recorded for Peter the Great Bay (theSea of Japan). The nominative subspecies occurs in the White and Kara seas, in thestraits of the New Land Archipelago.Vertical distribution. It was found in Peter the Great Bay at a depth of 130 m.Vertical distribution of the nominative subspecies ranges from 6 to 40 m depth.107