Spinocalanus abyssalis var. pygmaeus Farran, 1926, 



p. 243 (at least part). 

 Spinocalanus parabyssalis Park, 1970 (part), p. 483- 



485, fig. 23-33; female only. — Grice, 1971, p. 278- 



280, fig. 3E-F. 



Type Specimen: Holotype, female, on slide F6511, 

 OSLO. 



Type Locality: Central Arctic Ocean, Eurasian 

 Basin, ca. 100 m. 



Material Studied: 2 females (0.95, 1.08 mm), sample 

 1 (Table 3); holotype female, 38 paratype females (0.92- 

 1.05 mm, mean = 0.97 mm), 10 damaged females, 5 

 male stage V (0.88-0.95 mm, mean = 0.91 mm), and 2 

 damaged male stage V from sample 15; 6 females 

 (0.95-1.10 mm, mean = 1.03 mm), 1 female stage V 

 (0.88 mm), and 1 male (1.08 mm), sample 23; 1 female 

 (0.95 mm), sample 46; 1 female (0.88 mm), 

 "Spinocalanus parabyssalis Park, holotype, 0.98 

 mm," sample 55; 6 females (1.08-1.24 mm, mean = 

 1.18 mm), sample 60; 2 females (1.08, 1.1 mm), sam- 

 ple Al (Table 1); 1 female (1.05 mm), sample A2; 1 

 female (1.15 mm), sample A4; 2 females (1.08, 1.30 

 mm) and 1 male (1.25 mm), sample A6; 1 male (1.28 

 mm), sample A21; 1 male (1.36 mm), sample A22; 4 

 males (1.24-1.40 mm, mean = 1.31 mm), sample A23; 

 1 male (1.24 mm), sample A27; 5 females (1.15-1.20 

 mm, mean = 1.17 mm), sample A33; 5 females (1.12- 

 1.24 mm, mean = 1.17 mm) and 2 males (1.36, 1.40 

 mm), sample A34; 2 males (1.36, 1.40 mm), sample 

 A35; 3 males (1.28, 1.36, 1.40 mm), sample A36; 6 

 females (1.08-1.21 mm, mean = 1.14 mm), sample 

 A48; 1 female (1.15 mm), sample A50. 



Description 



Pi Ri with 2 inner setae; P2 Ri2 with no outer seta. 



Female.— Length (0.8?-) 0.88-1.30 mm (Figs. 11, 

 12). Prosome in dorsal view somewhat robust ovoid; 

 prosome length less than 2.4 times width. Head slight- 

 ly truncate in dorsal view, in lateral view with gentle 

 forward slope. Th4 and Th5 usually separate, 

 sometimes partly fused; Th5 lateral corners rounded, 

 not prolonged; Thl-Th4 without lateral spinules. 

 Prosome length about 3' 2 times urosome. Genital seg- 

 ment slightly wider than long, protruding ventrally 

 one-half depth of rest of urosome; caudal rami length 

 1' 2 times width, symmetrical; cluster of spinules on 

 outer dorsal surface. Caudal setae symmetrical; inner 

 setae moderately long. Supra-anal plate without 

 fringe of hairs. 



Al (Fig. 13) exceeding caudal rami by nearly 4 

 segments; terminal segments (Fig. 149) of moderate 

 length and width. Apparent deviation: I-2s; 

 remainder as Table 4. 



A2 Rel with 1 seta. 



Mn palp with inner row of setules on distal anterior 

 surface of B2 and on surface of Ril. Blade (Fig. 14) 



with 4 strong, evenly spaced ventral teeth, 4 smaller, 

 closer spaced teeth, and dorsal seta; proximal surface 

 with cluster of spinules. 



Mxl (Fig. 15) gnathobase with 3 proximal setae on 

 posterior surface, without seta on distal anterior sur- 

 face. 



Mx2 (Fig. 16) with small hump on proximal outer 

 edge, armed with spinules, setules, and hairs; outer 

 seta present (not seen on Arctic specimens); posterior 

 surface of lobe-5 base with spines. 



Mxp (Fig. 17) Bl without spine-comb; longitudinal 

 row of stiff hairs on midanterior surface; outer distal 

 edge with 2 posterior rows of short setules. Transverse 

 spine-comb of 5-6 short spines present or not on B2. 

 B2 with longitudinal row of stiff hairs. Outer 2 setae 

 on Ri4-5 nude, bladelike, tapering toward each end; 

 spinules on inner edge of Ri5. 



Pi (Fig. 18) Bl anterior surface with outer distal 

 row of spinules. B2 inner anterior surface with a few 

 spinules; inner margin with hairs. Rel anterior sur- 

 face with outer distal row of spinules; Re2 surface 

 appearing nude; Re3 surface nude. Rel outer spine 

 usually reaching beyond Re2; Re2 outer spine 

 reaching beyond base of Re3 outer spine. Ri surface 

 nude. 



P2 (Fig. 19) Bl surface nude, or with few setules, in- 

 ner margin with hairs. P3 (Fig. 20) Bl surface with 

 spinules and denticles, inner margin with hairs. P4 

 (Fig. 21) Bl surface, except for typical transverse row 

 of setules, nude; inner margin with hairs; B2 nude. 



Re2 posterior surface on P3 with proximal row of ca. 

 8 very broad, flat, leaflike spines and distal row of 5-6 

 denticles; on P4 with proximal row of ca. 7 similar 

 leaflike spines and distal row of 5-6 small spines. 



Re3 posterior surface on P2 and P3 without prox- 

 imal row of spines, but with 2 distal rows of 2-4 small 

 spines; on P4 without surface spines. 



P3 Ri3 posterior surface with 2 rows of spines. 



Re terminal seta with following number of primarv 

 teeth: P2 (31-44); P3 (30-43); P4 (24-35). P2 terminal 

 seta more than I'a times length of Re3; P3 terminal 

 seta slightly longer than Re3. 



Male.— Length 1-1.40 mm (Figs. 27, 28). Prosome 

 anterior irregular in dorsal view, posterior somewhat 

 rounded; in lateral view with gentle forward slope. Ce 

 and Thl partly fused. Prosome length 2 times 

 urosome. Caudal rami length slightly more than 

 width, symmetrical. Caudal setae as on female. 



Al (Fig. 29) reaching about end of Th4. IV- 

 2s,2e; Vni-2s,2e; XV-ls,le; XIX-ls,le; right XX-ls; 

 left XX- le; remainder as Table 4. 



A2 (Fig. 22) as on female except for typical 

 dimorphic characteristics. 



Mn blade (Figs. 23, 24) typically reduced, showing 

 some slight variability. 



Mxl gnathobase (Fig. 25) reduced, 3 or 4 sinuate 

 prongs. 



Mx2 (Fig. 26) typically reduced; proximal setae 



24 



