биота российских вод японского моря - Materials of Alexey Shipunov

II. Family AMMOTHEIDAE Dohrn, 1881The family combines rather different forms of sea spiders, having compact orelongated trunk, segmented or unsegmented. Chelifore consists of 1, 2, or 3 segments,poorly developed and usually shorter than proboscis, with feeble or reduced fingers,completely absent in some species. Palp often longer than proboscis, consisting of 6–10 (even 20) segments. Both males and females have 10-segmented oviger, with orwithout terminal claw, with compound spines, placed in rows or irregularly, or withcommon flat spines. Four pairs of legs present. Males have genital pores on 3rd and4th legs, females on all legs.KEY TO THE GENERA OF THE FAMILY AMMOTHEIDAE1(4). Trunk compact, disk-shaped, unsegmented or not completely segmented (insome specimens segmentation may be complete); lateral processes placed incontact or radiate out from trunk like rays.2(3). Chelifore 2-segmented; palp 8–9 segmented; coxa 1 of leg bears one tall dorsodistaltubercle ........................................................................ 1. Achelia (p. 105)3(2). Chelifore usually in shape of rudimentary buds; palp consists of 4–7 segments;coxa 1 of leg lacks dorso-distal tubercle ............................*Tanystylum (p. 114)4(1). Trunk elongated, segmented; lateral processes separated by broad intervals.5(6). Chelifore consists of one segment, very small; segment 7 of oviger curved, withtuft of setae on convex side; segment 8 implanted on side of segment 7 ............................................................................................. 2. Lecythorhynchus (p. 115)6(5). Chelifore consists of 2–3 segments; segment 7 of oviger not curved; segment 8implanted on it distally.7(8). Palp consists of 18–20 segments, distal part of it looking like whip; distal ends of1st legs also whip-shaped ............................................... *Nymphonella (p. 116)8(7). Palp consists of 9–10 segments; all legs identical, without whip-shaped ends.9(10). Anterior part of cephalic segment covers implantations of chelifores hood-like;segment 2 of oviger longest; proboscis oval .................... 3. Cilunculus (p. 117)10(9). Anterior part of cephalic segment does not cover implantations of chelifores;segment 2 of oviger much shorter than segment 4; proboscis with one or twoconstrictions, separating its medial oviform part from proximal and distalconical parts .................................................................. *Ascorhynchus (p. 118)1. Genus Achelia Hodge, 1864Type species: Achelia ehinata Hodge, 1864Trunk short, shield-shaped, unsegmented, partially segmented, or, very rarely,completely segmented. Anterior part of cephalic segment has two lateral angles;lateral processes in contact or separated by small intervals, having different width inmales and females. Ocular tubercle situated on anterior part of cephalic segment; eyeswell-developed. Proboscis heavy, often oval, spindle-shaped, sometimes cylindrical.Abdomen fused with distal segment of trunk, usually long. Chelifore short, consists of105