биота российских вод японского моря - Materials of Alexey Shipunov

2 segments; adults have vestigial chelae with reduced fingers or without them. Palpconsists of 6–8 segments, usually longer than proboscis. Oviger consists of 10segments, male oviger longer than female one, bearing few compound spines placedirregularly, or bearing simple spines placed similarly. Legs short, covered withtubercles and spines; femur distally bears conical process, larger in males, havingopening of cement gland on top in males; tarsus small, caliciform; propodus more orless curved; in most species propodal sole provided with large spines proximally andsmall spines medially and distally. Main claw usually large, curved; auxiliary clawsusually smaller than main one. Males have genital pores on special process (genitalspur), situated on coxa 2 of legs 3 and 4.KEY TO THE SPECIES OF THE GENUS ACHELIA1(14). Trunk unsegmented, without articulation lines.2(3). Propodal sole lacks isolated large spines; lateral processes in males long, thin,separated by intervals, expanding distally; no compound spines on oviger .................................................................................................... 1. A. borealis (p. 107)3(2). Propodal sole bears large spines.4(5). Dorsal side of trunk has two tubercles, placed one after another, with spines ontops; in adults abdomen base rises over trunk surface, making it saddle-shaped................................................................................. 2. A. bituberculata (p. 108)5(4). Dorsal side of trunk smooth and even, without any tubercles.6(7). Proboscis twice shorter than trunk, almost cylindrical, with rounded tip....................................................................................... *A. brevirostris (p. 108)7(6). Proboscis robust, almost equal to trunk in length, oval, spindle-shaped, orpyriform.8(9). Ocular tubercle cylindrical, tall, with conical top bearing small eyes; chelifores,palps and legs bear long spines, covered with short thin setae .......................................................................................................................... *A. latifrons (p. 109)9(8). Ocular tubercle low, conical; eyes situated in its middle part; all appendages bearlong spines without setae.10(11). Two small tubercles with apical spines on frontal margin of trunk and at distalangles of lateral processes; proboscis oval; chelifore longer than half ofproboscis; scape bears medial tubercle with spine on top ...................................................................................................................... 3. A. kurilensis (p. 109)11(10). Frontal margin of trunk smooth; each lateral process in adults bears one smalltubercle without spines (juveniles may lack such tubercles, or may have 2tubercles with apical spines on each lateral process); proboscis has anothershape; chelifore much shorter than half of proboscis.12(13). Proboscis spindle-shaped; propodus strong, noticeably curved; main clawheavy, reaching past middle of propodus; auxiliary claws slightly longer thanhalf of main claw ....................................................... 4. A. alaskensis (p. 110)13(12). Proboscis pyriform, consisting of conical basal part and large oviform part;propodus relatively thin, curved; main claw curved, reaching middle ofpropodus; auxiliary claws hardly reach middle of main claw ................................................................................................................ 5. A. gracilipes (p. 111)106