83 



Distribution: Northwestern part of the Pacific Ocean north of 40° N 

 (inclusive of the Bering Sea) and Antarctic regions (62° 55' S, 118° 52' 

 E). One of the deepest water hyperiideans, it possibly inhabits only the 

 abyssopelagic zone (deeper than 2,500-3,000 m) and enters deepwater 

 trenches. Found in catches from depths of over 2,500 m to the surface 

 and from 2,900, 3,000-4,000, 4,000-6,000, and 6,000-7,000 m. 



10. Lanceola longidactyla Vinogradov, 1964 (Fig. 19) 



Vinogradov, 1964: 112. 



Known from a lone sexually mature female 8 mm in length. 



The body is smooth with a thin integument. The pereon is broad, 

 the pleon is relatively short. A rostrum is absent. The eyes are small and 

 poorly noticeable. 

 73 The flagellum of antennae I has an elongated-conical, weakly 



pubescent proximal segment of the same shape as in L. clausi. The 

 peduncle in antennae II has a flat, broad, and oval 4th segment that 

 is slightly shorter than the 5th segment but twice broader than it; the 

 flagellum is 1 .5 times longer than the 5th segment of the peduncle. 



The mandibles have a broad cutting edge and an accessory plate 

 reduced to a spine. The palp is almost twice longer than the mandibu- 

 lar body, its 2nd segment broadened distally. Maxillae I and II and the 

 maxillipeds are the same as in L. clausi. 



Pereopods I and II have long claws which, in pereopods II, are only 

 slightly shorter than the 6th segment. The 5th segment of pereopods I is 

 longer than the 6th, its maximum width 1 .5 times its length. Pereopods II 

 are longer than pereopods I; the elongated 5th segment is slightly broad- 

 ened distally; the conical and slightly curved 6th segment is slightly 

 shorter than the 5th segment. Pereopods III and IV are similar in struc- 

 ture. In pereopods III the 4th segment is only slightly longer than the 3rd 

 and nearly 1/3 the length of the 5th, which in turn is equal to the 6th; the 

 claw is nearly straight, thin, and usually long, just less than 2/3 the 6th 

 segment. Pereopods V are slightly shorter and weaker than pereopods 

 IV; the 5th article is nearly equal to the 2nd, twice longer than the 4th 

 but somewhat shorter than the rod-shaped 6th article. The stronger pere- 

 opods VI are very slightly longer than pereopods V and have roughly 

 the same length ratio of segments. In pereopods VII the 6th article is 

 equal to the 2nd in length and slighdy longer than the 5th. The claws 

 on pereopods V-VII are not long, as in L. clausi. The uropods are rela- 

 tively short and broad, as in L. clausi. The telson is narrowly triangular, 

 slightly longer than half the length of the basipodite of uropods III. 



Notes: L. longidactyla distinctly differs from L. clausi in the shape of 

 the 4th segment of antennae H, stronger mandibular palp, very long claws 

 of the first four pairs of pereopods, and relatively longer 6th segment of 

 pereopods V-VII. 



