биота российских вод японского моря - Materials of Alexey Shipunov

tibia 2; propodal sole bears row of small spinules and 2–3 larger spines on proximalpart. Main claw thin, longer than half of propodus; auxiliary claws longer than half ofmain one. Measurements: trunk 1.5 mm, proboscis 2 mm, ocular tubercle almost1 mm, abdomen 1 mm, male oviger 6 mm, 2nd leg 10 mm.Geographical distribution. The species is known from the coastal regions of thenorth-west part of the Pacific Ocean. A. superba is distributed off the Pribilof andAleutian islands, near the coast of Japan, and near Sakhalin Island in the Sea ofOkhotsk. There is also a possibility that it may be found in the Tatar Strait.Vertical distribution. The species is found between 7 and 428 m depth.7. Achelia echinata orientalis Losina-Losinsky, 1933(Pl. XIII, figs. 1–7)Losina-Losinsky, 1933: 55–57, fig. 8 (Ammothea echinata ssp. orientalis); Lou, 1936:19, figs. 7–9, pls. II–IV (Ammothea (Achelia) echinata var. sinensis); Nesis, 1967: 249;Nakamura, 1987: 19–21, pls. 17, 35; 1994: 14 (Achelia echinata sinensis).Description. Trunk rounded; segments 1, 2, and 3 divided; segments 3 and 4fused. Lateral processes placed in contact. Frontal margin of cephalic segment anddistal amgles of lateral processes provided with 2 conical truncated tubercles withspines on tops. Ocular tubercle tall, cylindrical, with flat top, bearing tubercle in itscentre; eyes near top. Proboscis spindle-shaped, longer or equal to trunk, taperedproximally and distally. Abdomen cylindrical, reaching middle of coxae 2 of 4th legs,curved upward. Chelifore 3 times shorter than proboscis; scape bears tubercle, oftenbicuspidate and with spines on both tops, on outer distal end; chela small with twotubercles (reduced fingers). Palp 8-segmented, slightly longer than proboscis, thin;segments 2 and 4 longest; segment 2 almost equal in length to scape; segment 4shorter than scape. Oviger in males much longer than in females; segments 4 and 5equal and longest of all; other segments short; segments 6 ,7, 8 and 10 armed with 2compound spines; segment 9, with 1 compound spine (presence of compound spineson segment 6 of oviger – characteristic feature of A. echinata). Legs 4 times as long astrunk, strong, with short setae on ventral side and long setae on tubercles of dorsalside; coxa 1 in males provided distally with 2 tubercles with spines, sometimes forked;coxa 2 bears tubercles medially and distally; femur bears dorsodistal process withcement gland duct, pointed forward and armed with spine; femur, tibiae 1 and 2 equalin length; propodus 1.5 times shorter than tibia 2, strong, curved; its dorsal sidecovered with long setae; sole armed with row of short spines and, proximally, with 3–4 long spines. Main claw twice shorter than propodus; auxiliary claws longer than halfof main one.Remarks. This subspecies differs from the nominative species in the larger size(body length 3–3.5 mm), longer proboscis (which is also more than in North Atlanticspecimens tapered proximally and distally), and in the greater number of compoundspines on the distal segments of the oviger. Later a subspecies A. echinata sinensis(Lou) distributed farther south was described, characterized by another shape of theproboscis, the stronger armature, and another proportions of the palp and longsegments of the legs. However, these differences may be considered a result ofintraspecies variability, well displayed in the Sagami Bay collection (Nakamura,1987).113