биота российских вод японского моря - Materials of Alexey Shipunov

7. Nymphon braschnikowi (Schimkewitsch, 1906)(Pl. V, figs. 7–14)Schimkewitsch, 1906: 248–251, pl. I, figs. 2b, 3b, 4b, 5a, 6a; Hedgpeth, 1949: 250, fig.21a, c; Losina-Losinsky, 1961: 62; Turpaeva, 2001: 77–79, fig. 2; 2004b: 1232–1234, fig. 3.Description. Trunk robust, elongated, completely segmented. Lateral processesbroad, slightly more long than broad; separated by 3–4 times less than their owndiameters. Cephalic segment greatly expanded anteriorly; neck well developed, bearssmall processes of chelifores. Processes of ovigers in close contact with 1st legs lateralprocesses, almost as long in diameter as 3/4 length of neck. Ocular tubercle morebroad than tall, with flat top and large poorly pigmented eyes. Segments II and III oftrunk subequal in length, segment IV half shorter than each of them. Proboscis robust,cylindrical, slightly shorter than cephalic segment, protruded obliquely downward.Chelifore strong; scape slightly swollen distally, shorter than proboscis; chela longerthan scape; palm almost straight, thicker than scape and equal to it in length. Fingersheavy, far shorter than palm; immovable finger short, straight, wedge-shaped;movable finger longer than immovable one, curved proximally; both fingers bear veryshort, blunt, closely set teeth on inner margins. Palp 1.5 times shorter than chelifore;segment 2 longest; distal segments broad, rounded, their combined length slightly lessthan segment 3 length; segment 5 one and half times longer than its width. Ovigertwice longer than trunk; segments 4 and 5 equal in length and longest of all others; 3distal segments equal to one another. Compound spines curved, bear 3–4 pairs oflateral teeth. Terminal claw twice shorter than segment 10, straight, with very denselyset small blunt denticles on inner margin. Legs robust, seven times longer than trunk;coxae short; coxa 2 strongly expanded distally, asymmetrical; coxa 3 equal to coxa 1,also asymmetrical; femur and tibia 1 equal; tibia 2 one and half times longer than eachof them; tarsus and propodus short; tarsus twice as long as broad, propodus 1.5 timeslonger than tarsus, almost straight; propodal sole bears row of short setae and 5–6spines, equal in length to half of propodus width or less, situated medially and distally.Main claw almost straight, shorter than half of propodus; auxiliary claws small,shorter than 1/4 of main claw. Females differ from males in secondary characters: theyhave large genital pores on all legs and poorer armature, but bear short tough setae onfrontal margin of trunk, distally on lateral processes, and on all appendages.Measurements of female: trunk 7.2 mm, proboscis 3.5 mm, abdomen 1.8 mm,chelifore 7.7 mm, palp 4.8 mm, oviger 15.1 mm, 3rd leg 50.9 mm.As for juveniles, their chelae also bear short wedge-shaped fingers. Distalsegments of palp shorter than segment 3. Auxiliary claws on legs hardly noticeable.2nd coxa in male juveniles almost 3 times longer than 1st coxa, while tarsus more thantwice shorter than propodus.Geographical distribution. N. braschnikowi occurs in the Sea of Okhotsk, onthe shelf zone of the Kuril Islands; it has also been recorded in the Sea of Japan nearSakhalin Island. The finding of this species near the southern coast of HokkaidoIsland, reported by Hedgpeth, is doubtless. Judging by its appearance (Hedgpeth,1949, fig. 21), the specimen found must be identified as N. hodgsoni.Vertical distribution. The distribution range is between 26 and 120 m.103